supplicantThe interface acts only as a supplicant and does not respond to messages that are meant for an authenticator. What function is performed by the class maps configuration object in the Cisco modular policy framework? Each site commonly has a firewall and VPNs used by remote workers between sites. 110. Explanation: The characteristics of a DMZ zone are as follows:Traffic originating from the inside network going to the DMZ network is permitted.Traffic originating from the outside network going to the DMZ network is selectively permitted.Traffic originating from the DMZ network going to the inside network is denied. 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R1(config)# username R2 password 5tayout!R2(config)# username R1 password 5tayout! The recursive DNS resolver may also have knowledge about the requested information stored in DNS cache. Enable IP source guard on FastEthernet 0/10 Which algorithm can ensure data integrity? 104. Which commands would correctly configure a pre-shared key for the two routers? 121. Configure the hash as SHA and the authentication as pre-shared. What is typically used to create a security trap in the data center facility? This value informs the DNS resolver that the RR information received in the DNS query response message should not be stored in the cache of the resolver. The first 28 bits of a supplied IP address will be matched. This message indicates that the interface changed state five times. DNS Security Extensions (DNSSEC)adds security functions to the DNS protocol that can be used to prevent some of the attacks discussed in this document such as DNS cache poisoning. Refer to the exhibit. !-- Enable dns-guard to verify that DNS query and !-- response transaction IDs match and only one DNS !-- response is allowed through the firewall for !-- each query. (Choose two.). Cisco Secure network security products include firewalls, intrusion prevention systems, secure access systems, security analytics, and malware defense. Cisco IOS ACLs are processed sequentially from the top down and Cisco ASA ACLs are not processed sequentially. A statefull firewall will examine each packet individually while a packet filtering firewall observes the state of a connection. 8. BIND also allows operators the ability to select which addresses on the DNS server will provide answers from the DNS cache using the 'allow-query-cache-on' configuration option. Explanation: The disadvantage of operating with mirrored traffic is that the IDS cannot stop malicious single-packet attacks from reaching the target before responding to the attack. Enabling DNS guard through either the command line DNS Guard function or DNS application inspection provides preventive controls against DNS cache poisoning attacks. DNS is a globally distributed, scalable, hierarchical, and dynamic database that provides a mapping between hostnames, IP addresses (both IPv4 and IPv6), text records, mail exchange information (MX records), name server information (NS records), and security key information defined in Resource Records (RRs). Prevent endpoints from connecting to websites with bad reputations by immediately blocking connections based on the latest reputation intelligence. ! Explanation: Packet Filtering (Stateless) Firewall uses a simple policy table look-up that filters traffic based on specific criteria and is considered the easiest firewall to implement. ip verify source Refer to the exhibit. Which two features are included by both TACACS+ and RADIUS protocols? What functionality is provided by Cisco SPAN in a switched network? What are the three signature levels provided by Snort IPS on the 4000 Series ISR? Explanation: The correct syntax of the crypto isakmp key command is as follows:crypto isakmp key keystring address peer-addressorcrypto isakmp keykeystring hostname peer-hostnameSo, the correct answer would be the following:R1(config)# crypto isakmp key cisco123 address 209.165.200.227R2(config)# crypto isakmp key cisco123 address 209.165.200.226, 143. No packets have matched the ACL statements yet. Hint/Explanation: The implementation of an access list may provide extra security by permitting denying a flow of traffic, but it will not provide a direct response to limit the success of the attack. (Choose two.). (Choose three. This message indicates that the interface should be replaced. Each attack has unique identifiable attributes. 150. When describing malware, what is a difference between a virus and a worm? Labels are separated with "." The date and time displayed at the beginning of the message indicates that service timestamps have been configured on the router. An example is a 'DNS Referral Response Message', in which the Answer section is empty, but the Authority and Additional sections are present and contain RR information. Use the aaa local authentication attempts max-fail global configuration mode command with a higher number of acceptable failures. ), Explanation: Digital signatures use a mathematical technique to provide three basic security services:Integrity; Authenticity; Nonrepudiation. (Choose three. Which type of firewall is the most common and allows or blocks traffic based on Layer 3, Layer 4, and Layer 5 information? This feature should be tested in a lab environment before deployment in production environments. 95. A corporate network is using NTP to synchronize the time across devices. verified attack traffic is generating an alarmTrue positive, normal user traffic is not generating an alarmTrue negative, attack traffic is not generating an alarmFalse negative, normal user traffic is generating an alarmFalse positive. Additional information about regular expression syntax is available inUsing the Command Line Interface. What algorithm will be used for providing confidentiality? A network administrator configures a named ACL on the router. It uses a proxy server to connect to remote servers on behalf of clients. Explanation: Reconnaissance attacks attempt to gather information about the targets. 30. The DNS protocol specification and implementation was originally defined in. represents the root zone. Explanation: The pass action performed by Cisco IOS ZPF permits forwarding of traffic in a manner similar to the permit statement in an access control list. Both the ASA CLI and the router CLI use the # symbol to indicate the EXEC mode. (Choose two.). 142. 52. Refer to the exhibit. Explanation: To address the interoperability of different PKI vendors, IETF published the Internet X.509 Public Key Infrastructure Certificate Policy and Certification Practices Framework (RFC 2527). This type of traffic is typically email, DNS, HTTP, or HTTPS traffic. Match the security concept to the description. Network Security (Version 1) Network Security 1.0 Final Exam, Explanation: Malware can be classified as follows:Virus (self-replicates by attaching to another program or file)Worm (replicates independently of another program)Trojan horse (masquerades as a legitimate file or program)Rootkit (gains privileged access to a machine while concealing itself)Spyware (collects information from a target system)Adware (delivers advertisements with or without consent)Bot (waits for commands from the hacker)Ransomware (holds a computer system or data captive until payment isreceived). DNS cache poisoning occurs when an attacker sends falsified and usually spoofed RR information to a DNS resolver. For every inbound ACL placed on an interface, there should be a matching outbound ACL. Use the login local command for authenticating user access. 105. Therefore, the uplink interface that connects to a router should be a trusted port for forwarding ARP requests. 58. MD5 and SHA-1 can be used to ensure data integrity. The implementation of a firewall on the network edge may prevent reconnaissance attacks from the Internet, but attacks within the local network are not prevented. Gi0/0 192.0.2.6 Gi0/1 192.168.60.27 11 0B7B 0035 2, Maliciously Abusing Implementation Flaws in DNS, Detecting and Preventing DNS Attacks using Cisco Products and Features, DNS Server Secure Cache Against Pollution, Know Your Enemy: Fast-Flux Service Networks, Understanding Unicast Reverse Path Forwarding, Configuring DHCP Features and IP Source Guard. 92. Create a firewall rule blocking the respective website. Explanation: Secure segmentation is used when managing and organizing data in a data center. TCP-WWW 77625 0.0 14 570 0.2 10.1 38.5 Network scanning is used to discover available resources on the network. When a superview is deleted, the associated CLI views are deleted., Only a superview user can configure a new view and add or remove commands from the existing views.. ), What are two data protection functions provided by MDM? Traffic from the less secure interfaces is blocked from accessing more secure interfaces. Configure Snort specifics. Step 6. What statement describes an internal threat? TACACS provides secure connectivity using TCP port 49. If a public key encrypts the data, the matching private key decrypts the data. These configurations are applied to the DNS Server service either through the Windows user interface (UI) or from the command-line (CLI). Explanation: File transfer using FTP is transmitted in plain text. We truly value your contribution to the website. Features include: to flood your network with UDP packets as fast as possible to see how much it can take. Which parameter can be used in extended ACLs to meet this requirement? Why is there no output displayed when the show command is issued? Both are fully supported by Cisco and include Cisco customer support. Refer to the exhibit. Letters of the message are rearranged randomly. ACLs are used primarily to filter traffic. Attackers analyze the transaction ID values generated by the DNS implementation to create an algorithm that can be used to predict the next DNS transaction ID used for a query message. Issue the show crypto ipsec sa command to verify the tunnel. 123. All other traffic is allowed. 34. The IPv6 access list LIMITED_ACCESS is applied on the S0/0/0 interface of R1 in the inbound direction. On which two interfaces or ports can security be improved by configuring executive timeouts? 1. 75. 47. An advantage of this is that it can stop an attack immediately. An authoritative DNS server distributes information to DNS resolvers for authorative domain name space. .000 .414 .091 .015 .032 .024 .018 .004 .010 .001 .003 .002 .002 .005 .007 Because standard ACLs do not specify a destination address, they should be placed as close to the destination as possible. ASA uses the ? TP-Link: Newer TP-Link routers (Archer series): Click on the Advanced Tab. IPS Signature 4004/0 (Signature Name: DNS Flood Attack) can be specifically used to detect potential DNS Cache Poisoning, Reflection, or Amplification attacks. MIB search Home. 48. (Choose two.). ), 12. Match the IPS alarm type to the description. Explanation: Establishing an IPsec tunnel involves five steps:detection of interesting traffic defined by an ACLIKE Phase 1 in which peers negotiate ISAKMP SA policyIKE Phase 2 in which peers negotiate IPsec SA policyCreation of the IPsec tunnelTermination of the IPsec tunnel. Release Notes for the Cisco ASA Series, 9.12(x) -Release Notes: Release Notes for the Cisco ASA Series, 9.12(x) ASA cannot send syslog to two UDP ports at same time. UDP-DNS 96765 0.0 5 71 0.1 37.6 43.6 Remote servers will see only a connection from the proxy server, not from the individual clients. Syslog does not authenticate or encrypt messages. 112. Explanation: Telnet sends passwords and other information in clear text, while SSH encrypts its data. Terminal servers can have direct console connections to user devices needing management. If a private key is used to encrypt the data, a private key must be used to decrypt the data. What are two differences between stateful and packet filtering firewalls? Filtering unwanted traffic before it enters low-bandwidth links preserves bandwidth and supports network functionality. Which protocol is an IETF standard that defines the PKI digital certificate format? Generate a set of secret keys to be used for encryption and decryption. The two ACEs of permit 192.168.10.0 0.0.0.63 and permit 192.168.10.64 0.0.0.63 allow the same address range through the router. What is the function of the pass action on a Cisco IOS Zone-Based Policy Firewall? Which statement is true about the effect of this Cisco IOS zone-based policy firewall configuration? 39. If recursion is disabled, operators will not be able to use DNS forwarders on that server. Would love your thoughts, please comment. 31. During the second phase IKE negotiates security associations between the peers. Privilege levels cannot specify access control to interfaces, ports, or slots. What will be displayed in the output of the show running-config object command after the exhibited configuration commands are entered on an ASA 5506-X? DHCP snooping, which is a prerequisite of IP source guard, inspects DHCP traffic within a VLAN to understand which IP addresses have been assigned to which network devices on which physical switch port. Berkeley Internet Name Domain (BIND), a software product of Internet Systems Consortium, Inc., implements the DNS protocol that is discussed in this document. 33. For example, administrators could choose to use anevent action filterto monitor for traffic destined to only the DNS servers, or only port 53. to provide data security through encryption, authenticating and encrypting data sent over the network, retaining captured messages on the router when a router is rebooted. match default-inspection-traffic ! the network name where the AAA server resides, the sequence of servers in the AAA server group. Also, the dynamic keyword in the nat command indicates that it is a dynamic mapping. The network administrator for an e-commerce website requires a service that prevents customers from claiming that legitimate orders are fake. WANs typically connect over a public internet connection. Cisco provides the official information contained on the Cisco Security portal in English only. 15. Explanation: Port security is the most effective method for preventing CAM table overflow attacks. (Choose three.). Loose mode Unicast RPF can be enabled on Cisco IOS devices using theip verify source reachable-via anyinterface configuration command; loose mode Unicast RPF is not available on Cisco PIX, ASA or FWSM firewalls. Which statement describes an important characteristic of a site-to-site VPN? A network administrator is configuring AAA implementation on an ASA device. Refer to the exhibit. (Choose two.). Refer to the exhibit. Another multifaceted technique used by attackers is to rapidly change hostname to IP address mappings for both DNS A (address) RRs and DNS NS (name server) RRs, creating a Double-Flux (DF) network. Which network monitoring technology uses VLANs to monitor traffic on remote switches? 102. What command is used on a switch to set the port access entity type so the interface acts only as an authenticator and will not respond to any messages meant for a supplicant? Which type of cryptographic key should be used in this scenario? This traffic is permitted with little or no restriction. The dhcpd auto-config outside command was issued to enable the DHCP server. These are likely to use large DNS packets to increase their efficiency; however large packets are not a requirement. The firewall also monitors the message exchange to ensure that the transaction ID of the DNS reply matches the transaction ID of the initial DNS query. Strict mode Unicast RPF can be enabled on the Cisco PIX, ASA, and FWSM firewalls using theip verify reverse-path interfaceinterfaceconfiguration command. Microsoft pleaded for its deal on the day of the Phase 2 decision last month, but now the gloves are well and truly off. Both have a 30-day delayed access to updated signatures. Which protocol or measure should be used to mitigate the vulnerability of using FTP to transfer documents between a teleworker and the company file server? UDP-Frag 301039 0.0 6 569 0.4 0.0 15.6 A tool that attempts to collect all possible information available for a domain. This provides nonrepudiation of the act of publishing. The firewall will automatically allow HTTP, HTTPS, and FTP traffic from s0/0/0 to g0/0, but will not track the state of connections. separate authentication and authorization processes. Refer to the exhibit. Flaws have been discovered in DNS where the implementations do not provide sufficient entropy in the randomization of DNS transaction IDs when issuing queries. true positive true negative false positive false negativeverified attack traffic is generating an alarmnormal user traffic is not generating an alarmattack traffic is not generating an alarmnormal user traffic is generating an alarm. -------- Flows /Sec /Flow /Pkt /Sec /Flow /Flow The only traffic denied is ICMP-based traffic. Explanation: The permit 192.168.10.0 0.0.0.127 command ignores bit positions 1 through 7, which means that addresses 192.168.10.0 through 192.168.10.127 are allowed through. Which IPv6 packets from the ISP will be dropped by the ACL on R1? The ACL has not been applied to an interface. The opposite is also true. Refer to the exhibit. Which type of packet is unable to be filtered by an outbound ACL? Both port 80, HTTP traffic, and port 443, HTTPS traffic, are explicitly permitted by the ACL. Which statement is a feature of HMAC? The configure terminal command is rejected because the user is not authorized to execute the command. What type of network security test can detect and report changes made to network systems? parameters Cisco Secure Firewall ASA New Features by Release -Release Notes: Cisco Secure Firewall ASA New Features by Release ASA provides protection against CSRF attacks for WebVPN handlers. DNS Amplification or Reflection Attack: A high rate of DNS response traffic, from multiple sources, with a source port of 53 (attackers) destined to your network (attack target). The certificate revocation list (CRL) and Online Certificate Status Protocol (OCSP), are two common methods to check a certificate revocation status. 157342957 ager polls, 0 flow alloc failures The idea is that passwords will have been changed before an attacker exhausts the keyspace. Inactive flows timeout in 60 seconds Explanation: In a brute-force attack, an attacker tries every possible key with the decryption algorithm knowing that eventually one of them will work. 111. Two popular algorithms that are used to ensure that data is not intercepted and modified (data integrity) are MD5 and SHA. Each sales office has a SOHO network. Which pair ofcrypto isakmp keycommands would correctly configure PSK on the two routers? These configurations are applied in the 'named.conf' configuration file. Match the security term to the appropriate description. 137. Explanation: Security traps provide access to the data halls where data center data is stored. Prevent spam emails from reaching endpoints. Some examples of the DNS resolution process follow: Figure 2 illustrates the iterative process used by a DNS recursive resolver (DNS Recursor, server) to answer the DNS query message (question) on behalf of the DNS resolver (DNS Resolver, client) and provide a DNS query response message (answer). Provide security awareness training. What is needed to allow specific traffic that is sourced on the outside network of an ASA firewall to reach an internal network? What action will occur when PC1 is attached to switch S1 with the applied configuration? The DNS guard function inspects and tears down an existing DNS connection associated with a DNS query as soon as the first DNS response message is received and forwarded by the firewall. These messages provide additional information about denied packets. 153. To defend against the brute-force attacks, modern cryptographers have as an objective to have a keyspace (a set of all possible keys) large enough so that it takes too much money and too much time to accomplish a brute-force attack. command extracts syslog messages from the logging buffer on the firewall. What network testing tool can be used to identify network layer protocols running on a host? A virus can be used to deliver advertisements without user consent, whereas a worm cannot. Tripwire is used to assess if network devices are compliant with network security policies. A user complains about being locked out of a device after too many unsuccessful AAA login attempts. An IDS is deployed in promiscuous mode. Continue Reading. HMAC uses protocols such as SSL or TLS to provide session layer confidentiality. Area string router-LSA of length number bytes plus update overhead bytes is too large to flood. The example that follows demonstrates how ACLs can be used in order to limit IP spoofing. Which measure can a security analyst take to perform effective security monitoring against network traffic encrypted by SSL technology? Which two steps are required before SSH can be enabled on a Cisco router? What are two security features that are commonly found in such a network configuration? Both devices use an implicit deny, top down sequential processing, and named or numbered ACLs. R1(config)# crypto isakmp key cisco123 address 209.165.200.226, R1(config)# crypto isakmp key cisco123 hostname R1. What network testing tool is used for password auditing and recovery? (Choose three. A virus focuses on gaining privileged access to a device, whereas a worm does not. Refer to the exhibit. (Choose two.). Match the type of ASA ACLs to the description. A company implements a security policy that ensures that a file sent from the headquarters office to the branch office can only be opened with a predetermined code. policy-map type inspect dns preset_dns_map Queries from known sources (clients inside your administrative domain) may be allowed for information we do not know (for example, for domain name space outside our administrative domain). Which component of this HTTP connection is not examined by a stateful firewall? What function is performed by the class maps configuration object in the Cisco modular policy framework? After the person is inside the security trap, facial recognition, fingerprints, or other biometric verifications are used to open the second door. Using an out-of-band communication channel (OOB) either requires physical access to the file server or, if done through the internet, does not necessarily encrypt the communication. switchport 18. 81. What tool is available through the Cisco IOS CLI to initiate security audits and to make recommended configuration changes with or without administrator input? How does a firewall handle traffic when it is originating from the public network and traveling to the DMZ network? Explanation: NAT can be deployed on an ASA using one of these methods:inside NAT when a host from a higher-security interface has traffic destined for a lower-security interface and the ASA translates the internal host address to a global addressoutside NAT when traffic from a lower-security interface destined for a host on the higher-security interface is translatedbidirectional NAT when both inside NAT and outside NAT are used togetherBecause the nat command is applied so that the inside interface is mapped to the outside interface, the NAT type is inside. UDP-NTP 486955 0.1 1 76 0.1 5.2 58.4 The hostname to IP address mapping for devices in the requested domain name space will rapidly change (usually anywhere from several seconds to a few minutes). Another potentially malicious use of a short TTL is using a value of 0. This white paper provides information on general best practices, network protections, and attack identification techniques that operators and administrators can use for implementations of the Domain Name System (DNS) protocol. ): Explanation: ACLs are used to filter traffic to determine which packets will be permitted or denied through the router and which packets will be subject to policy-based routing. The following table lists the DNS specific signatures provided on the Cisco IPS appliance with signature pack S343. Refer to the exhibit. Ask the user to stop immediately and inform the user that this constitutes grounds for dismissal. If a CSRF attack is detected, a user is notified by warning messages. Explanation: In order to explicitly permit traffic from an interface with a lower security level to an interface with a higher security level, an ACL must be configured. Explanation: Manual configuration of the single allowed MAC address has been entered for port fa0/12. Use the none keyword when configuring the authentication method list. Which IPv6 packets from the ISP will be dropped by the ACL on R1? Which two statements describe the use of asymmetric algorithms. Use statistical analysis to eliminate the most common encryption keys. Refer to the exhibit. The DNS protocol specification and implementation was originally defined inRFC 882andRFC 883. Commandes Cisco CCNA Exploration. A packet filtering firewall is able to filter sessions that use dynamic port negotiations while a stateful firewall cannot. Match the security management function with the description. Explanation: There are five steps involved to create a view on a Cisco router.1) AAA must be enabled.2) the view must be created.3) a secret password must be assigned to the view.4) commands must be assigned to the view.5) view configuration mode must be exited. What are three characteristics of the RADIUS protocol? 132. Place standard ACLs close to the destination IP address of the traffic. For additional configuration options, consult theBIND 9.5 Administrator Reference Manualthat can be used to secure BIND. Those who have a checking or savings account, but also use financial alternatives like check cashing services are considered underbanked. A web server administrator is configuring access settings to require users to authenticate first before accessing certain web pages. By combining these resolver functions on a single DNS server and allowing the server to be accessible via the Internet, malicious users could employ the authoritative DNS server in amplification attacks or easily poison the DNS cache. Decrease the wireless antenna gain level. ), Explanation: There are four steps to configure SSH on a Cisco router. The DNS protocol leverages the User Datagram Protocol (UDP) for the majority of its operations. Password requirements: 6 to 30 characters long; ASCII characters only (characters found on a standard US keyboard); must contain at least 4 different symbols; PolicyDefines business intent including creation of virtual (Choose two. Which attack is defined as an attempt to exploit software vulnerabilities that are unknown or undisclosed by the vendor? What technology has a function of using trusted third-party protocols to issue credentials that are accepted as an authoritative identity? The configuration of this feature, when configurable, will be detailed later in the feature configuration section. Port security gives an administrator the ability to manually specify what MAC addresses should be seen on given switch ports. ACLs provide network traffic filtering but not encryption. The firewall will automatically drop all HTTP, HTTPS, and FTP traffic. Explanation: A CLI view has no command hierarchy, and therefore, no higher or lower views. Your use of the information in the document or materials linked from the document is at your own risk. Explanation: OOB management provides a dedicated management network without production traffic. A tool that will monitor and display DNS messages seen on the network. 40. Explanation: Snort IPS mode can perform all the IDS actions plus the following: Drop Block and log the packet. Reject Block the packet, log it, and then send a TCP reset if the protocol is TCP or an ICMP port unreachable message if the protocol is UDP. Sdrop Block the packet but do not log it. Indicators of compromise are the evidence that an attack has occurred. Microsoft provides additional information operators can use to harden the configuration of the DNS Server service. Refer to the exhibit. Which two technologies provide enterprise-managed VPN solutions? Which statement describes a difference between the Cisco ASA IOS CLI feature and the router IOS CLI feature? You have already completed the quiz before. What action should the administrator take first in terms of the security policy? 65. Attackers use this exploitation technique to redirect users from legitimate sites to malicious sites or to inform the DNS resolver to use a malicious name server (NS) that is providing RR information used for malicious activities. L0phtcrack provides password auditing and recovery. The normalizer always sees the SYN packet as the first packet in a flow unless Cisco ASA is in loose mode because of failover. The dhcpd enable inside command was issued to enable the DHCP client. With the help of the powerful protection from Beyond Security and others, Fortra is your relentless ally, here for you every step of When an inbound Internet-traffic ACL is being implemented, what should be included to prevent the spoofing of internal networks? This feature is available beginning with software release 7.2(1) for Cisco ASA and Cisco PIX 500 Firewalls. 82. (Choose two.). Which two options are security best practices that help mitigate BYOD risks? CLI views have passwords, but superviews do not have passwords. A security service company is conducting an audit in several risk areas within a major corporation. Fix the ACE statements so that it works as desired inbound on the interface. (Choose two.). Note:Team Cymrualso provides aSecure BIND Templatethat operators can use as a guide for hardening their DNS servers. Which component is addressed in the AAA network service framework? These special modules include: Advanced Inspection and Prevention (AIP) module supports advanced IPS capability. Content Security and Control (CSC) module supports antimalware capabilities. Cisco Advanced Inspection and Prevention Security Services Module (AIP-SSM) and Cisco Advanced Inspection and Prevention Security Services Card (AIP-SSC) support protection against tens of thousands of known exploits. This field can be used maliciously by setting the value for an RR to a short or long TTL value.. By using a short TTL value, malicious users can leverage DNS to distribute information about a large number of devices hosting malicious code or being used for malicious activities to DNS resolvers. 73. A technician is to document the current configurations of all network devices in a college, including those in off-site buildings. In an attempt to prevent network attacks, cyber analysts share unique identifiable attributes of known attacks with colleagues. This feature is not supported on the FWSM firewalls. Secure Copy Protocol (SCP) conducts the authentication and file transfer under SSH, thus the communication is encrypted. What three types of attributes or indicators of compromise are helpful to share? Data center visibility is designed to simplify operations and compliance reporting by providing consistent security policy enforcement. The VPN is static and stays established. Explanation: A symmetric key requires that both routers have access to the secret key that is used to encrypt and decrypt exchanged data. (Choose three.). What is the main difference between the implementation of IDS and IPS devices? ! Several security controls can be implemented to limit spoofing. Which two ACLs, if applied to the G0/1 interface of R2, would permit only the two LAN networks attached to R1 to access the network that connects to R2 G0/1 interface? 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