Exam Prep Questions

Question 1	Which file is used to associate network names with network numbers ? A. /etc/inet/ hosts B. /etc/inet/ netmasks C. /etc/inet/networks D. /etc/defaultrouter
A1:	Answer C is correct because /etc/inet/networks is the file used to associate network names with network numbers. Answer A is incorrect because /etc/inet/hosts is used to map IP addresses to hostnames. Answer B is incorrect because /etc/inet/netmasks is used to associate IPv4 network masks with IPv4 network numbers. Answer D is incorrect because /etc/defaultrouter is the file that contains the hostname or IP address of the default gateway.
Question 2	If host A has an IP address of 192.168.28.28 and host B has an IP address of 192.168.28.12 , which type of routing takes place when host A sends an IP datagram to host B? A. Static route B. Dynamic route C. Indirect route D. Direct route
A2:	Answer D is correct because the two hosts are on the same physical network, so a direct route is used. Answers A and B are incorrect because static and dynamic routes are entries in the routing table, not routing types. Answer C is incorrect because an indirect route is used when the two hosts are on different physical networks, connected via a router.
Question 3	Your system is a non-router and you want to receive advertisement messages from other routers to determine the default routes. Which command would run the correct daemon process to do this? A. /usr/sbin/in.rdisc -r B. /usr/sbin/in.rdisc -s C. /usr/sbin/in.routed -q D. /usr/sbin/in.routed -s
A3:	Answer B is correct because the in.rdisc -s command would be used by a non-router to request information from other routers on the network about default routes. Answer A is incorrect because in.rdisc -r is the command that a router would run to advertise its presence on the network every 10 minutes. Answers C and D are incorrect because the in.routed command starts the routing daemon, but does not contain information about default routes.
Question 4	The Routing Information Protocol (RIP) uses a feature that advertises a failed route with a hop count of 16 to stop other systems from trying to use an unavailable route. What is this feature called? A. Route poisoning B. Split horizons C. Hopcount limit D. Update triggers
A4:	Answer A is correct because route poisoning is a feature that advertises a failed route with a hopcount of 16 to mark it as unreachable. This prevents other systems on the network from trying to use the failed route. Answer B is incorrect because split horizons is a feature that prevents a router from sending an advertisement back to the router from which the information came. This prevents routing loops between two systems. Answer C is incorrect because the hopcount limit feature sets a limit of 15 hops to stop continuous routing loops , but is not used to stop other systems from trying to use a specific route. Any route that contains a hopcount greater than 15 is deemed to be unreachable. This feature is used by route poisoning to force a route to breach the hopcount limit. Answer D is incorrect because update triggers is a feature that allows routing changes to be propagated quickly throughout the network, without waiting for the next scheduled advertisement.
Question 5	Which command would manually add a default route by using the gateway named gate01 as the router? A. route add gate01 default B. route add default gate01 C. route default gate01 D. route default add gate01
A5:	Answer B is correct because the correct command to add a default route that uses the host named gate01 as the gateway is route add default gate01 . Answers A, C, and D are incorrect because the syntax is incorrect for the route command.
Question 6	Which of the following are interior gateway protocols? Choose 2. A. RIP B. EGP C. BGP D. OSPF
A6:	Answers A and D are correct because both the Routing Information Protocol (RIP) and the Open Shortest Path First (OSPF) are interior gateway protocols that are used to exchange routing information between IP routers within an autonomous system. Answers B and C are incorrect because the Exterior Gateway Protocol (EGP) and Border Gateway Protocol (BGP) are examples of exterior gateway protocols that exchange routing information between autonomous systems.
Question 7	If you are having trouble communicating with a remote host, which command would you use to follow the path taken to reach the host? A. ping B. netstat C. traceroute D. ifconfig -a
A7:	Answer C is correct because the traceroute command is used to follow the path taken to reach a specified remote host. Answer A is incorrect because the ping command is used to verify that a remote host is responding to communications, but does not trace the path taken to reach the remote host. Answer B is incorrect because the netstat command is used to provide network statistics. Answer D is incorrect because the ifconfig -a command is used to verify the network interface configuration.
Question 8	What command do you use to see any changes that are made to the routing table immediately? A. route monitor B. netstat -r C. route change D. route flush
A8:	Answer A is correct because the route monitor command is used to see changes made to the routing table immediately. Answer B is incorrect because the netstat -r command is used to view the routing table entries at a point in time; it does not show any subsequent updates to the routing table unless the command is run again. Answer C is incorrect because the route change command is used to modify a route entry. Answer D is incorrect because the route flush command is used to flush (delete) all routing entries from the routing table.