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IT (Subject) / ITNv7 Final Exam (Lesson)
- A new network administrator has been asked to enter a banner message on a Cisco device. What is the fastest way a network administrator could test whether the banner is properly configured? Enter CTRL-Z at the privileged mode prompt. Power cycle the device. Exit privileged EXEC mode and press Enter. (x) Exit global configuration mode. Reboot the device Answers Explanation & Hints: While at the privileged mode prompt such as Router#, type exit ,press Enter , and the banner message appears. Power cycling a network device that has had the banner motd command issued will also display the banner message, but this is not a quick way to test the configuration.
- What happens when the transport input ssh command is entered on the switch vty lines? The switch requires a username/password combination for remote access. The SSH client on the switch is enabled. Communication between the switch and remote users is encrypted. (x) The switch requires remote connections via a proprietary client software Answers Explanation & Hints: The transport input ssh command when entered on the switch vty (virtual terminal lines) will encrypt all inbound controlled telnet connections.
- What is the subnet ID associated with the IPv6 address 2001:DA48:FC5:A4:3D1B::1/64? 2001:DA48::/64 2001::/64 2001:DA48:FC5:A4::/64 (x) 2001:DA48:FC5::A4:/64 Explanation: The /64 represents the network and subnet IPv6 fields. The fourth field of hexadecimal digits is referred to as the subnet ID. The subnet ID for this address is 2001:DA48:FC5:A4::0/64.
- A client is using SLAAC to obtain an IPv6 address for its interface. After an address has been generated and applied to the interface, what must the client do before it can begin to use this IPv6 address? It must send an ICMPv6 Router Solicitation message to determine what default gateway it should use. It must send a DHCPv6 INFORMATION-REQUEST message to request the address of the DNS server. It must send a DHCPv6 REQUEST message to the DHCPv6 server to request permission to use this address. It must send an ICMPv6 Neighbor Solicitation message to ensure that the address is not already in use on the network. (x) Explanation: Stateless DHCPv6 or stateful DHCPv6 uses a DHCP server, but Stateless Address Autoconfiguration (SLAAC) does not. A SLAAC client can automatically generate an address that is based on information from local routers via Router Advertisement (RA) messages. Once an address has been assigned to an interface via SLAAC, the client must ensure via Duplicate Address Detection (DAD) that the address is not already in use. It does this by sending out an ICMPv6 Neighbor Solicitation message and listening for a response. If a response is received, then it means that another device is already using this address.
- Which range of link-local addresses can be assigned to an IPv6-enabled interface? FE80::/10 (x) FDEE::/7 FF00::/8 FEC0::/10 Explanation: Link-local addresses are in the range of FE80::/10 to FEBF::/10. The original IPv6 specification defined site-local addresses and used the prefix range FEC0::/10, but these addresses were deprecated by the IETF in favor of unique local addresses. FDEE::/7 is a unique local address because it is in the range of FC00::/7 to FDFF::/7. IPv6 multicast addresses have the prefix FF00::/8.
- What mechanism is used by a router to prevent a received IPv4 packet from traveling endlessly on a network? It checks the value of the TTL field and if it is 100, it discards the packet and sends a Destination Unreachable message to the source host. It increments the value of the TTL field by 1 and if the result is 100, it discards the packet and sends a Parameter Problem message to the source host. It checks the value of the TTL field and if it is 0, it discards the packet and sends a Destination Unreachable message to the source host. It decrements the value of the TTL field by 1 and if the result is 0, it discards the packet and sends a Time Exceeded message to the source host. (x)
- A network administrator is designing the layout of a new wireless network. Which three areas of concern should be accounted for when building a wireless network? (Choose three.) mobility options security (x) interference (x) coverage area (x) packet collision extensive cabling Explanation: The three areas of concern for wireless networks focus on the size of the coverage area, any nearby interference, and providing network security. Extensive cabling is not a concern for wireless networks, as a wireless network will require minimal cabling for providing wireless access to hosts. Mobility options are not a component of the areas of concern for wireless networks.
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