CCNAS final exam 题目和答案

CCNA Security, final exam. 1 窗体顶端 Refer to the exhibit. The administrator can ping the S0/0/1 interface of RouterB but is unable to gain Telnet access to the router using the password cisco123. What is a possible cause of the problem? The Telnet connection between RouterA and RouterB is not working correctly. The password cisco123 is wrong. The enable password and the Telnet password need to be the same. The administrator does not have enough rights on the PC that is being used. 窗体底端 2 窗体顶端 If a switch is configured with the storm-control command and the action shutdown and action trap parameters, which two actions does the switch take when a storm occurs on a port? (Choose two.) The port is disabled. The switch is rebooted. An SNMP log message is sent. The port is placed in a blocking state. The switch forwards control traffic only. 窗体底端 3 窗体顶端 A network technician is configuring SNMPv3 and has set a security level of auth. What is the effect of this setting? authenticates a packet using the SHA algorithm only authenticates a packet by a string match of the username or community string authenticates a packet by using either the HMAC with MD5 method or the SHA method authenticates a packet by using either the HMAC MD5 or HMAC SHA algorithms and encrypts the packet using either the DES, 3DES or AES algorithms 窗体底端 4 窗体顶端 Refer to the exhibit. An administrator has configured router R1 as indicated. However, SDEE messages fail to log. Which solution corrects this problem? Issue the logging on command in global configuration. Issue the ip ips notify sdee command in global configuration. Issue the ip audit notify log command in global configuration. Issue the clear ip ips sdee events command to clear the SDEE buffer. 窗体底端 5 窗体顶端 Which authentication method is available when specifying a method list for group policy lookup using the CCP Easy VPN Server wizard? Active Directory Kerberos Certificate Authority RADIUS TACACS+ 窗体底端 6 窗体顶端 What are two disadvantages of using network IPS? (Choose two.) Network IPS has a difficult time reconstructing fragmented traffic to determine if an attack was successful. Network IPS is incapable of examining encrypted traffic. Network IPS is operating system-dependent and must be customized for each platform. Network IPS is unable to provide a clear indication of the extent to which the network is being attacked. Network IPS sensors are difficult to deploy when new networks are added. 窗体底端 7 窗体顶端 Which type of Layer 2 attack makes a host appear as the root bridge for a LAN? LAN storm MAC address spoofing MAC address table overflow STP manipulation VLAN attack 窗体底端 8 窗体顶端 Which three statements describe limitations in using privilege levels for assigning command authorization? (Choose three.) There is no access control to specific interfaces on a router. The root user must be assigned to each privilege level defined. Commands set on a higher privilege level are not available for lower privileged users. Views are required to define the CLI commands that each user can access. Creating a user account that needs access to most but not all commands can be a tedious process. It is required that all 16 privilege levels be defined, whether they are used or not. 窗体底端 9 窗体顶端 Which statement describes the operation of the IKE protocol? It uses IPsec to establish the key exchange process. It uses sophisticated hashing algorithms to transmit keys directly across a network. It calculates shared keys based on the exchange of a series of data packets. It uses TCP port 50 to exchange IKE information between the security gateways. 窗体底端 10 窗体顶端 Refer to the exhibit. Which three things occur if a user attempts to log in four times within 10 seconds using an incorrect password? (Choose three.) Subsequent virtual login attempts from the user are blocked for 60 seconds. During the quiet mode, an administrator can virtually log in from any host on network 172.16.1.0/24. Subsequent console login attempts are blocked for 60 seconds. A message is generated indicating the username and source IP address of the user. During the quiet mode, an administrator can log in from host 172.16.1.2. No user can log in virtually from any host for 60 seconds. 窗体底端 11 窗体顶端 Which type of encryption algorithm uses public and private keys to provide authentication, integrity, and confidentiality? IPsec symmetric asymmetric shared secret 窗体底端 12 窗体顶端 Which component of AAA is used to determine which resources a user can access and which operations the user is allowed to perform? auditing accounting authorization authentication 窗体底端 13 窗体顶端 Refer to the exhibit. An administrator has entered the commands that are shown on router R1. At what trap level is the logging function set? 2 3 5 6 窗体底端 14 窗体顶端 Which type of packets exiting the network of an organization should be blocked by an ACL? packets that are not encrypted packets that are not translated with NAT packets with source IP addresses outside of the organization's network address space packets with destination IP addresses outside of the organization's network address space 窗体底端 15 窗体顶端 What are three goals of a port scan attack? (Choose three.) disable used ports and services determine potential vulnerabilities identify active services identify peripheral configurations identify operating systems discover system passwords 窗体底端 16 窗体顶端 Which three statements describe zone-based policy firewall rules that govern interface behavior and the traffic moving between zone member interfaces? (Choose three.) An interface can be assigned to multiple security zones. Interfaces can be assigned to a zone before the zone is created. Pass, inspect, and drop options can only be applied between two zones. If traffic is to flow between all interfaces in a router, each interface must be a member of a zone. Traffic is implicitly prevented from flowing by default among interfaces that are members of the same zone. To permit traffic to and from a zone member interface, a policy allowing or inspecting traffic must be configured between that zone and any other zone. 窗体底端 17 窗体顶端 Which statement correctly describes a type of filtering firewall? A transparent firewall is typically implemented on a PC or server with firewall software running on it. A packet-filtering firewall expands the number of IP addresses available and hides network addressing design. An application gateway firewall (proxy firewall) is typically implemented on a router to filter Layer 3 and Layer 4 information. A stateful firewall monitors the state of connections, whether the connection is in an initiation, data transfer, or termination state. 窗体底端 18 窗体顶端 Which three statements describe the IPsec protocol framework? (Choose three.) AH uses IP protocol 51. AH provides encryption and integrity. AH provides integrity and authentication. ESP uses UDP protocol 50. ESP requires both authentication and encryption. ESP provides encryption, authentication, and integrity. 窗体底端 19 窗体顶端 Which set of Cisco IOS commands instructs the IPS to compile a signature category named ios_ips into memory and use it to scan traffic? R1(config)# ip ips signature-category R1(config-ips-category)# category all R1(config-ips-category-action)# retired false R1(config)# ip ips signature-category R1(config-ips-category)# category ios_ips basic R1(config-ips-category-action)# retired false R1(config)# ip ips signature-category R1(config-ips-category)# category all R1(config-ips-category-action)# no retired false R1(config)# ip ips signature-category R1(config-ips-category)# category ios_ips basic R1(config-ips-category-action)# no retired false 窗体底端 20 窗体顶端 Which type of IPS signature detection is used to distract and confuse attackers? pattern-based detection anomaly-based detection policy-based detection honey pot-based detection 窗体底端 21 窗体顶端 Which action best describes a MAC address spoofing attack? altering the MAC address of an attacking host to match that of a legitimate host bombarding a switch with fake source MAC addresses forcing the election of a rogue root bridge flooding the LAN with excessive traffic 窗体底端 22 窗体顶端 An administrator has been asked to configure basic access security on a router, including creating secure passwords and disabling unattended connections. Which three actions accomplish this using recommended security practices? (Choose three.) Create passwords with only alphanumeric characters. Set the minimum password length to 10 characters. Set the executive timeout parameters on the console port to 120 and 0. Set the executive timeout parameters on the vty lines to 3 and 0. Enable the password encryption service for the router. Enable login using the Aux port with the executive timeout set to 0 and 0. 窗体底端 23 窗体顶端 Refer to the exhibit. An administrator is implementing VPN support on an ASA 5505. What type of VPN support is being implemented? client-based IPsec VPN using Cisco VPN Client client-based IPsec VPN using AnyConnect client-based SSL VPN using AnyConnect clientless IPsec VPN clientless SSL VPN site-to-site IPsec VPN 窗体底端 24 窗体顶端 Which three statements should be considered when applying ACLs to a Cisco router? (Choose three.) Place generic ACL entries at the top of the ACL. Place more specific ACL entries at the top of the ACL. Router-generated packets pass through ACLs on the router without filtering. ACLs always search for the most specific entry before taking any filtering action. A maximum of three IP access lists can be assigned to an interface per direction (in or out). An access list applied to any interface without a configured ACL allows all traffic to pass. 窗体底端 25 窗体顶端 What must be configured before any Role-Based CLI views can be created? aaa new-model command multiple privilege levels secret password for the root user usernames and passwords 窗体底端 26 窗体顶端 Refer to the exhibit. What information can be obtained from the AAA configuration statements? The authentication method list used for Telnet is named ACCESS. The authentication method list used by the console port is named ACCESS. The local database is checked first when authenticating console and Telnet access to the router. If the TACACS+ AAA server is not available, no users can establish a Telnet session with the router. If the TACACS+ AAA server is not available, console access to the router can be authenticated using the local database. 窗体底端 27 窗体顶端 Refer to the exhibit. Based on the output from the show secure bootset command on router R1, which three conclusions can be drawn regarding Cisco IOS Resilience? (Choose three.) A copy of the Cisco IOS image file has been made. A copy of the router configuration file has been made. The Cisco IOS image file is hidden and cannot be copied, modified, or deleted. The Cisco IOS image filename will be listed when the show flash command is issued on R1. The copy tftp flash command was issued on R1. The secure boot-config command was issued on R1. 窗体底端 28 窗体顶端 What will be disabled as a result of the no service password-recovery command? aaa new-model global configuration command changes to the configuration register password encryption service ability to access ROMmon 窗体底端 29 窗体顶端 Which two configuration requirements are needed for remote access VPNs using Cisco Easy VPN Server, but are not required for site-to-site VPNs? (Choose two.) group policy lookup IPsec translations virtual template interface IKE policies transform sets 窗体底端 30 窗体顶端 An administrator wants to prevent a rogue Layer 2 device from intercepting traffic from multiple VLANs on a network. Which two actions help mitigate this type of activity? (Choose two.) Disable DTP on ports that require trunking. Place unused active ports in an unused VLAN. Secure the native VLAN, VLAN 1, with encryption. Set the native VLAN on the trunk ports to an unused VLAN. Turn off trunking on all trunk ports and manually configure each VLAN as required on each port. 窗体底端 31 窗体顶端 What occurs after RSA keys are generated on a Cisco router to prepare for secure device management? All vty ports are automatically configured for SSH to provide secure management. The general-purpose key size must be specified for authentication with the crypto key generate rsa general-keys modulus command. The keys must be zeroized to reset secure shell before configuring other parameters. The generated keys can be used by SSH. 窗体底端 32 窗体顶端 Which statement describes the CCP Security Audit wizard? After the wizard identifies the vulnerabilities, the CCP One-Step Lockdown feature must be used to make all security-related configuration changes. After the wizard identifies the vulnerabilities, it automatically makes all security-related configuration changes. The wizard autosenses the inside trusted and outside untrusted interfaces to determine possible security problems that might exist. The wizard is based on the Cisco IOS AutoSecure feature. The wizard is enabled by using the Intrusion Prevention task. 窗体底端 33 窗体顶端 Which two commands are needed on every IPv6 ACL to allow IPv6 neighbor discovery? (Choose two.) permit tcp any any ack permit icmp any any nd-na permit icmp any any echo-reply permit icmp any any nd-ns permit ipv6 any any fragments permit ipv6 any any routing 窗体底端 34 窗体顶端 Which attack allows the attacker to see all frames on a broadcast network by causing a switch to flood all incoming traffic? LAN storm VLAN hopping STP manipulation MAC table overflow 802.1q double tagging 窗体底端 35 窗体顶端 Refer to the exhibit. An administrator is examining the message in a syslog server. What can be determined from the message? This is a notification message for a normal but significant condition. This is an alert message for which immediate action is needed. This is an error message for which warning conditions exist. This is an error message indicating the system is unusable. 窗体底端 36 窗体顶端 When logging is enabled for an ACL entry, how does the router switch packets filtered by the ACL? topology-based switching autonomous switching process switching optimum switching 窗体底端 37 窗体顶端 Which type of VPN may require the Cisco VPN Client software? remote access VPN SSL VPN site-to-site VPN MPLS VPN 窗体底端 38 窗体顶端 When configuring a site-to-site IPsec VPN using the CLI, the authentication pre-share command is configured in the ISAKMP policy. Which additional peer authentication configuration is required? Configure the message encryption algorithm with the encryptiontype ISAKMP policy configuration command. Configure the DH group identifier with the groupnumber ISAKMP policy configuration command. Configure a hostname with the crypto isakmp identity hostname global configuration command. Configure a PSK with the crypto isakmp key global configuration command. 窗体底端 39 窗体顶端 The use of 3DES within the IPsec framework is an example of which of the five IPsec building blocks? authentication confidentiality Diffie-Hellman integrity nonrepudiation 窗体底端 40 窗体顶端 What can be used as a VPN gateway when setting up a site-to-site VPN? Cisco Catalyst switch Cisco router Cisco Unified Communications Manager Cisco AnyConnect 窗体底端 41 窗体顶端 Which statement is true about the One-Step lockdown feature of the CCP Security Audit wizard? It enables the Secure Copy Protocol (SCP). It supports AAA configuration. It enables TCP intercepts. It sets an access class ACL on vty lines. It provides an option for configuring SNMPv3 on all routers. 窗体底端 42 窗体顶端 Which type of intrusion prevention technology is primarily used by Cisco IPS security appliances? rule-based profile-based signature-based NetFlow anomaly-based protocol analysis-based 窗体底端 43 窗体顶端 Which command would an administrator use to clear generated crypto keys? Router(config)# crypto key decrypt Router(config-line)# transport input ssh clear Router(config)# crypto key rsa Router(config)# crypto key zeroize rsa 窗体底端 44 窗体顶端 What are three common examples of AAA implementation on Cisco routers? (Choose three.) authenticating administrator access to the router console port, auxiliary port, and vty ports authenticating remote users who are accessing the corporate LAN through IPsec VPN connections implementing public key infrastructure to authenticate and authorize IPsec VPN peers using digital certificates implementing command authorization with TACACS+ securing the router by locking down all unused services tracking Cisco Netflow accounting statistics 窗体底端 45 窗体顶端 When port security is enabled on a Cisco Catalyst switch, what is the default action when the maximum number of allowed MAC addresses is exceeded? The violation mode for the port is set to restrict. The MAC address table is cleared, and the new MAC address is entered into the table. The port remains enabled, but the bandwidth is throttled until the old MAC addresses are aged out. The port is shut down. 窗体底端 46 窗体顶端 Which statement describes configuring ACLs to control Telnet traffic destined to the router itself? The ACL must be applied to each vty line individually. The ACL is applied to the Telnet port with the ip access-group command. Apply the ACL to the vty lines without the in or out option required when applying ACLs to interfaces. The ACL should be applied to all vty lines in the in direction to prevent an unwanted user from connecting to an unsecured port. 窗体底端 47 窗体顶端 Refer to the exhibit. What conclusion can be drawn from the exhibited window when it is displayed on a remote user computer screen? The user has connected to a secure web server. The user has established a client-based VPN connection. The user has logged out of the AnyConnect VPN client. The user is installing the AnyConnect VPN client. The user is using a web browser to connect to a clientless SSL VPN. 窗体底端 48 窗体顶端 Refer to the exhibit. An administrator has configured an ASA 5505 as indicated but is still unable to ping the inside interface from an inside host. What is the cause of this problem? An IP address should be configured on the Ethernet 0/0 and 0/1 interfaces. The no shutdown command should be entered on interface Ethernet 0/1. The security level of the inside interface should be 0 and the outside interface should be 100. VLAN 1 should be assigned to interface Ethernet 0/0 and VLAN 2 to Ethernet 0/1. VLAN 1 should be the outside interface and VLAN 2 should be the inside interface. 窗体底端 49 窗体顶端 Refer to the exhibit. Which interface configuration completes the CBAC configuration on router R1? R1(config)# interface fa0/0 R1(config-if)# ip inspect INSIDE in R1(config-if)# ip access-group OUTBOUND in R1(config)# interface fa0/1 R1(config-if)# ip inspect INSIDE in R1(config-if)# ip access-group OUTBOUND in R1(config)# interface fa0/1 R1(config-if)# ip inspect OUTBOUND in R1(config-if)# ip access-group INSIDE out R1(config)# interface fa0/0 R1(config-if)# ip inspect OUTBOUND in R1(config-if)# ip access-group INSIDE in R1(config)# interface fa0/1 R1(config-if)# ip inspect OUTBOUND in R1(config-if)# ip access-group INSIDE in 窗体底端 50 窗体顶端 What a