Ccna certification Practice Tests

411

 59.  C.  The command 

debug ip packet will turn on debugging for IP packets. The 

output will display the exit interface that the traffic is taking, to include the source and 

destination IP addresses. This command should be used with caution because it could 

create high CPU utilization on the router. It is recommended to be used with an ACL. 

The command 

ping 192.168.3.5 Gi 0/1 is incorrect. The command ping Gi 0/1 

192.168.3.5 is incorrect. The command debug ip ping is incorrect.

 60.  B.  The third hop (router) is not responding to ICMP echo requests. The traceroute 

completes since the fourth hop responded and the user did not need to perform a break 

on the command. Therefore, it can be concluded that the third hop is not down. The 

traceroute completes after 4 hops; only the third hop is not responding with ICMP replies. 

The exhibit does not show evidence that packets have been rerouted.

 61.  D.  An extended ping allows for the source interface or IP address to be specified. You can 

access the extended ping by entering the command 

ping without an IP address and then 

following the prompt till it asks if you want extended commands. Datagram size, repeat 

counts, and timeout can be set when using the normal 

ping command options.

 62.  A.  The probe count attribute must be changed to allow multiple packets to be sent to each 

hop. The default is three packets. Numeric display defaults to both numbers and symbols 

for the output. The maximum time to live (TTL) is used to set the number of hops before 

a ping request is considered unrouteable. Packet type is not an option for an extended 

traceroute; therefore, this is an invalid answer.

 63.  C.  An area defines a topology inside of the OSPF hierarchy. Since each router in an area 

calculates its own costs, they all contain the same topological database, or LSDB. It is 

not true that all the routers in the same area have the same neighbor table. All routers in 

the same area do not need to share the same hello/dead timers; only their adjacent routers 

must be configured with matching hello/dead timers. All routers do not need the same 

process ID, since this is a local value to define the process OSPF is running on the local 

router.

 64.  B.  Link-State Advertisement (LSA) packets communicate the topology of the local router 

with other routers in the OSPF area. The information contained in the LSA packet is a 

summary of links the local router’s topology consists of. Hello packets are used to notify 

adjacent routers that the link is still valid. The Link State Acknowledgment (LSAck) 

packets verify that an LSA has been received. Dead packets are not a real type of packet 

because when a link goes down, there will be an absence of hello packets, tripping the 

dead time.

 65.  C.  When interface tracking is turned on and a link that is being tracked fails, the priority 

of the active router is lowered and an election is forced. This will make the standby router 

become the active router. However, if the link is repaired, the priority will recover to 

its normal value, but the current active router will remain the active router. Preemption 

allows for the value to instantly reelect the original router as the active router. Interface 

tracking resets, failback options, and priority tracking are not valid options for interface 

tracking; therefore, these are invalid answers.

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