CCNA Routing and Switching v3.0

 

QUESTION 111

Which statements describe the routing protocol OSPF? (Choose three.)

 

A.

It supports VLSM.

B.

It is used to route between autonomous systems.

C.

It confines network instability to one area of the network.

D.

It increases routing overhead on the network.

E.

It allows extensive control of routing updates.

F.

It is simpler to configure than RIP v2.

 

Correct Answer: ACE

Explanation:

The OSPF protocol is based on link-state technology, which is a departure from the Bellman-Ford vector based algorithms used in traditional Internet routing protocols such as RIP. OSPF has introduced new concepts such as authentication of routing updates, Variable Length Subnet Masks (VLSM), route summarization, and so forth. OSPF uses flooding to exchange link-state updates between routers. Any change in routing information is flooded to all routers in the network. Areas are introduced to put a boundary on the explosion of link-state updates. Flooding and calculation of the Dijkstra algorithm on a router is limited to changes within an area.

 

 

QUESTION 112

A router has learned three possible routes that could be used to reach a destination network. One route is from EIGRP and has a composite metric of 20514560. Another route is from OSPF with a metric of 782. The last is from RIPv2 and has a metric of 4. Which route or routes will the router install in the routing table?

 

A.

the OSPF route

B.

the EIGRP route

C.

the RIPv2 route

D.

all three routes

E.

the OSPF and RIPv2 routes

 

Correct Answer: B

Explanation:

When one route is advertised by more than one routing protocol, the router will choose to use the routing protocol which has lowest Administrative Distance. The Administrative Distances of popular routing protocols are listed below:

 

clip_image002

 

 

QUESTION 113

Before installing a new, upgraded version of the IOS, what should be checked on the router, and which command should be used to gather this information? (Choose two.)

 

A.

the amount of available ROM

B.

the amount of available flash and RAM memory

C.

the version of the bootstrap software present on the router

D.

show version

E.

show processes

F.

show running-config

 

Correct Answer: BD

Explanation:

When upgrading a new version of the IOS we need to copy the IOS to the Flash so first we have to check if the Flash has enough memory or not. Also running the new IOS may require more RAM than the older one so we should check the available RAM too. We can check both with the “show version” command.

 

 

QUESTION 114

What are two enhancements that OSPFv3 supports over OSPFv2? (Choose two.)

 

A.

It requires the use of ARP.

B.

It can support multiple IPv6 subnets on a single link.

C.

It supports up to 2 instances of OSPFv3 over a common link.

D.

It routes over links rather than over networks.

 

Correct Answer: BD

Explanation:

Here is a list of the differences between OSPFv2 and OSPFv3:

 

clip_image004They use different address families (OSPFv2 is for IPv4-only, OSPFv3 can be used for IPv6-only or both protocols

clip_image004[1]OSPFv3 introduces new LSA types

clip_image004[2]OSPFv3 has different packet format

clip_image004[3]OSPFv3 uses different flooding scope bits (U/S2/S1)

clip_image004[4]OSPFv3 adjacencies are formed over link-local IPv6 communications

clip_image004[5]OSPFv3 runs per-link rather than per-subnet

clip_image004[6]OSPFv3 supports multiple instances on a single link, Interfaces can have multiple IPv6 addresses

clip_image004[7]OSPFv3 uses multicast addresses FF02::5 (all OSPF routers), FF02::6 (all OSPF DRs)

clip_image004[8]OSPFv3 Neighbor Authentication done with IPsec (AH)

clip_image004[9]OSPFv2 Router ID (RID) must be manually configured, still a 32-bit number

 

Reference: http://www.networkworld.com/article/2225270/cisco-subnet/ospfv3-for-ipv4-and-ipv6.html

 

 

QUESTION 115

DRAG DROP

clip_image006

 

Correct Answer:

clip_image008

 

 

QUESTION 116

Refer to the exhibit. The network administrator requires easy configuration options and minimal routing protocol traffic. What two options provide adequate routing table information for traffic that passes between the two routers and satisfy the requests of the network administrator? (Choose two.)

 

clip_image010

 

A.

a dynamic routing protocol on InternetRouter to advertise all routes to CentralRouter.

B.

a dynamic routing protocol on InternetRouter to advertise summarized routes to CentralRouter.

C.

a static route on InternetRouter to direct traffic that is destined for 172.16.0.0/16 to CentralRouter.

D.

a dynamic routing protocol on CentralRouter to advertise all routes to InternetRouter.

E.

a dynamic routing protocol on CentralRouter to advertise summarized routes to InternetRouter.

F.

a static, default route on CentralRouter that directs traffic to InternetRouter.

 

Correct Answer: CF

Explanation:

The use of static routes will provide the necessary information for connectivity while producing no routing traffic overhead.

 

 

QUESTION 117

Refer to the exhibit. What is the effect of the configuration that is shown?

 

clip_image012

 

A.

It configures SSH globally for all logins.

B.

It tells the router or switch to try to establish an SSh connection first and if that fails to use Telnet.

C.

It configures the virtual terminal lines with the password 030752180500.

D.

It configures a Cisco network device to use the SSH protocol on incoming communications via the virtual terminal ports.

E.

It allows seven failed login attempts before the VTY lines are temporarily shutdown.

 

Correct Answer: D

Explanation:

Secure Shell (SSH) is a protocol which provides a secure remote access connection to network devices. Communication between the client and server is encrypted in both SSH version 1 and SSH version 2. If you want to prevent non-SSH connections, add the “transport input ssh” command under the lines to limit the router to SSH connections only.

Straight (non-SSH) Telnets are refused.

Reference: www.cisco.com/warp/public/707/ssh.shtml

 

 

QUESTION 118

Refer to the exhibit. The company uses EIGRP as the routing protocol. What path will packets take from a host on the 192.168.10.192/26 network to a host on the LAN attached to router R1?

 

clip_image014

 

A.

The path of the packets will be R3 to R2 to R1.

B.

The path of the packets will be R3 to R1 to R2.

C.

The path of the packets will be both R3 to R2 to R1 AND R3 to R1.

D.

The path of the packets will be R3 to R1.

 

Correct Answer: D

Explanation:

Host on the LAN attached to router R1 belongs to 192.168.10.64/26 subnet. From the output of the routing table of R3 we learn this network can be reach via 192.168.10.9, which is an IP address in 192.168.10.8/30 network (the network between R1 & R3) -> packets destined for 192.168.10.64 will be routed from R3 -> R1 -> LAN on R1.

 

 

QUESTION 119

Refer to the graphic. R1 is unable to esta
blish an OSPF neighbor relationship with R3. What are possible reasons for this problem? (Choose two.)

 

clip_image016

 

A.

All of the routers need to be configured for backbone Area 1.

B.

R1 and R2 are the DR and BDR, so OSPF will not establish neighbor adjacency with R3.

C.

A static route has been configured from R1 to R3 and prevents the neighbor adjacency from being established.

D.

The hello and dead interval timers are not set to the same values on R1 and R3.

E.

EIGRP is also configured on these routers with a lower administrative distance.

F.

R1 and R3 are configured in different areas.

 

Correct Answer: DF

Explanation:

This question is to examine the conditions for OSPF to create neighborhood. So as to make the two routers become neighbors, each router must be matched with the following items:

 

1. The area ID and its types;

2. Hello and failure time interval timer;

3. OSPF Password (Optional).

 

 

QUESTION 120

Refer to the exhibit. A network administrator configures a new router and enters the copy startup-config running-config command on the router. The network administrator powers down the router and sets it up at a remote location. When the router starts, it enters the system configuration dialog as shown. What is the cause of the problem?

 

clip_image018

 

A.

The network administrator failed to save
the configuration.

B.

The configuration register is set to 0x2100.

C.

The boot system flash command is missing from the configuration.

D.

The configuration register is set to 0x2102.

E.

The router is configured with the boot system startup command.

 

Correct Answer: A

Explanation:

The “System Configuration Dialog” appears only when no startup configuration file is found. The network administrator has made a mistake because the command “copy startup-config running-config” will copy the startup config (which is empty) over the running config (which is configured by the administrator). So everything configured was deleted. Note: We can tell the router to ignore the start-up configuration on the next reload by setting the register to 0?142. This will make the “System Configuration Dialog” appear at the next reload.

 

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