CCNA 2ND Module Question & Ans

1 What is the purpose of the TTL field in the IP header?

used to mark routes as unreachable in updates sent to other routers

prevents regular update messages from reinstating a route that may have gone bad

prevents a router from advertising a network through the interface from which the update came

limits the time or hops that a packet can traverse through the network before it should be discarded

defines a maximum metric value for each distance vector routing protocol by setting a maximum hop count

2 What is the default update period in seconds for the RIP routing protocol?

10

12

15

20

30

60

3 Which of the following is considered a limitation of RIP v1?

RIP v1 does not send subnet mask information in its updates.

RIP v1 is not widely supported by networking hardware vendors.

RIP v1 consumes excessive bandwidth by multicasting routing updates using a Class D address.

RIP v1 requires enhanced router processors and extra RAM to function effectively.

RIP v1 does not support load balancing across equal-cost paths.

RIP v1 authentication is complicated and time-consuming to configure.

4  Which command will display RIP activity as it occurs on a router?

debug ip rip

show ip route

show ip interface

show ip protocols

debug ip rip config

show ip rip database

5 What are three characteristics of the RIPv1 routing protocol? (Choose three.)

supports the use of VLSM

uses hop count as a metric

considers a metric of 16 as infinity

has an administrative distance of 110 by default

includes the destination IP address and subnet mask in routing updates

calculates metrics using the Bellman Ford algorithm

6 Which two statements correctly describe the concepts of administrative distance and metric? (Choose two.)
Administrative distance refers to the trustworthiness of a particular route.
A router first installs routes with higher administrative distances.
The value of the administrative distance can not be altered by the network administrator.
Routes with the smallest metric to a destination indicate the best path.
The metric is always determined based on hop count.
The metric varies depending which Layer 3 protocol is being routed, such as IP or IPX.


7 Refer to the exhibit. Which statement correctly describes how R1 will determine the best path to R2?
R1 will install a RIP route using network A in its routing table because the administrative distance of RIP is higher than EIGRP.
R1 will install a RIP route using network A in its routing table because the path cost from RIP is lower than EIGRP.
R1 will install an EIGRP route using network B in its routing table because the administrative distance of EIGRP is lower than RIP.
R1 will install an EIGRP route using network B in its routing table because the path cost from EIGRP is lower than RIP.
R1 will install an EIGRP route and a RIP route in its routing table and load balance between them.


8 Which two statements are true regarding classless routing protocols? (Choose two.)
sends subnet mask information in routing updates
sends complete routing table update to all neighbors
is supported by RIP version 1
 allows for use of both 192.168.1.0/30 and 192.168.1.16/28 subnets in the same topology
reduces the amount of address space available in an organization

9  Which command would the network administrator issue to determine if load balancing is in effect on a router?
show ip protocols
show ip route
show ip interface brief
show ip interface

10 Which statement is true regarding routing protocols?
RIP uses hop count and bandwidth as the metric for path selection and sendsupdates periodically.
OSPF is a Cisco proprietary protocol that sends updates triggered by topology changes.
EIGRP uses DUAL to calculate the shortest path and can be configured to do unequal cost load balancing.
BGP is a path vector interior routing protocol.

11 Which two conditions would create a setting where the use of a distance-vector routing protocol would be efficient? (Choose two.)
the network requires a special hierarchical design
fast convergence of the network is crucial
the network is using a hub and spoke topology
the network is using a flat design
there are more than 15 hops between the most distant routers

12 What is the purpose of a routing protocol?
It is used to build and maintain ARP tables.
It provides a method for segmenting and reassembling data packets.
It allows an administrator to devise an addressing scheme for the network.
It allows a router to share information about known networks with other routers.
It provides a procedure for encoding and decoding data into bits for packet forwarding.


13 Which of the following best describes the operation of distance vector routing protocols?
They use hop count as their only metric.
They only send out updates when a new network is added.
They send their routing tables to directly connected neighbors.
They flood the entire network with routing updates.

14 Which of the following is associated with link-state routing protocols?
low processor overhead
poison reverse
routing loops
split horizon
shortest-path first calculations

15  Why is fast convergence desirable in networks that use dynamic routing protocols?
Routers will not allow packets to be forwarded until the network has converged.
Hosts are unable to access their gateway until the network has converged.
Routers may make incorrect forwarding decisions until the network has converged.
Routers will not allow configuration changes to be made until the network has converged.