Exam Prep Practice Questions

Question 1	When you use the trace command, one line in the output displays an N character; what is the meaning of that character? A. Node has a newer version of TCP/IP B. The network is unreachable C. The network protocol is unreachable D. Not a valid port number
A1:	Answer: B. The trace command returns an "N" character when the network is not reachable . A "P" character would indicate the protocol is unreachable and a "U" character indicates that the port is unreachable.
Question 2	Which show command would be used to find out if there is a gateway of last resort configured on the router? A. show ip route B. show ip protocol C. show ip gateway D. show ip default
A2:	Answer: A. The show ip route command is used to determine whether a router has a gateway of last resort configured. The show running-config or show startup-config commands both display the configuration on the router and also display a configured default route. However, the proper way to troubleshoot if a default route is configured is to use the show ip route command.
Question 3	The Time-Exceeded message indicating that a hop count limit has been exceeded is sent by which of the following protocols? A. ARP B. ICMP C. UDP D. IP
A3:	Answer: B. An ICMP response with a "Time-exceeded" message is sent when the maximum hop count is exceeded and there is no additional routing information available.
Question 4	Which of the following is a broadcast sent by ARP when it is unable to locate a host on the network? A. 224.255.255.255 B. FFFFFFFF C. 11111111 D. 00000000
A4:	Answer: B. FFFFFFFF is equal to the broadcast address of 255.255.255.255, which is the address ARP uses to broadcast over a LAN.
Question 5	Which of the following will resolve a hostname to an IP address? A. DHCP B. Windows C. DNS D. NetBIOS
A5:	Answer: C. A Domain Name Service (DNS) is used to resolve a hostname to an IP address.
Question 6	When configuring a network client to access the Internet from a LAN, you need an IP address, subnet mask, and default gateway. A. True B. False
A6:	Answer: A. An IP address, subnet mask, and a default gateway are all required to access the Internet from a LAN using a network client. A DNS server address will also allow the client to make FQDN and hostname resolutions .
Question 7	What command must be configured on a local Cisco router to allow DHCP clients to get a DHCP IP Address and DHCP configuration from a remote router? A. ip dhcp pool B. ip dhcp distribution C. ip helper-address D. ip broadcast-helper
A7:	Answer: C. The ip helper-address command is the command used to allow broadcasts for certain protocols, including DHCP, to traverse routers in the network. The ip dhcp pool command is a valid command but would be used to define the DHCP pool on the remote Cisco router providing DHCP server services.
Question 8	Which of the following addresses indicates a default route address? A. 255.255.255.255 B. 255.255.0.0 C. 10.255.255.255 D. 0.0.0.0
A8:	Answer: D. The address of 0.0.0.0 indicates a default route or the gateway of last resort. 255.255.255.255 and 10.255.255.255 are broadcast addresses and the address of 255.255.0.0 is a Class B subnet address.
Question 9	When are ARP entries removed from the ARP Cache table? [Choose the three best answers.] A. Whenever a new static entry is made, the cache clears. B. They must be manually removed. C. When the Time-To-Live(TTL) expires . D. When the clear arp-cache command is used. E. If you reboot the router
A9:	Answer. C, D, E. Cache entries are removed when the TTL expires, the routers is rebooted, or when the command clear arp-cache is executed.
Question 10	Which of the following best describes a ping? A. Ping is an end-to-end test of connectivity using ICMP. B. Ping uses UDP to test for WINS compatibility. C. Ping can be used to test for MX records in DNS. D. Ping can be used to verify connectivity to an FQDN.
A10:	Answer: A. The characteristics of a ping are to determine reachability from end-to-end using the ICMP protocol. Ping does not check MX records in DNS or WINS. Ping can be used to verify connectivity to an FQDN by checking a DNS server for the IP address of an FQDN. Static entries can also be made in the routers configuration for FQDN and NetBIOS names . Another ICMP tool called using the trace command provides hop-by-hop information connectivity information.