Question 1

You are troubleshooting a connectivity problem in your corporate network and want to isolate the problem. You suspect that a router on the route to an unreachable network is at fault. What IOS user exec command should you issue?

Accepted Answer

The command traceroute (trace for short), which can be issued from user mode or privileged mode, is used to find the path a packet takes through an internetwork and will also show you where the packet stops because of an error on a router.

Question 2

You need to gather the IP address of a remote switch that is located in Hawaii. What can you do to find the address?

Accepted Answer

Although option A is certainly the "best" answer, unfortunately option E will work just fine and your boss would probably prefer you to use the show cdp neighbors detail command.

Question 3

If you want to have more than one Telnet session open at the same time, what keystroke combination would you use?

Accepted Answer

To keep open one or more Telnet sessions, use the Ctrl+Shift+6 and then X keystroke combination.

Question 4

What is the command to copy a Cisco IOS to a TFTP server?

Accepted Answer

copy flash tftp

Question 5

Which of the following is the best description of the operation of split horizon?

Accepted Answer

A split horizon will not advertise a route back to the same router it learned the route from.

Question 6

Which command displays RIP routing updates?

Accepted Answer

Debug ip rip is used to show the internet Protocol (IP) Routng Information protocol (RIP) updates being sent and received on the router.

Question 7

What metric does RIPv2 use to find the best path to a remote network?

Accepted Answer

RIPv1 and RIPv2 only use the lowest hop count to determine the best path to a remote network.

Question 8

Two connected routers are configured only with RIP routing. What will be the result when a router receives a routing update that contains a higher-cost path to a network already in its routing table?

Accepted Answer

When a routing update is received by a router, the router first checks the administrative distance (AD) and always chooses the route with the lowest AD. However, if two routes are received and they both have the same AD and differing metrics , then the router will choose the one route with the lowest metrics or , in RIP's case, hop count.

Question 9

When a PC sends a packet to another PC in a remote network, what destination IP address and MAC address will be in the frame that it sends to its default gateway?

Accepted Answer

It will use the gateway interface MAC at L2 and the actual destination IP at L3

Question 10

If routers in a single area are configured with the same priority value, what value does a router use for the OSPF Router ID in the absence of a loopback interface?

Accepted Answer

At the moment of OSPF process startup, the highest IP address on any active interface will be the Router ID (RID) of the router . If you have a loopback interface configured (logical interface), then that will override the interface IP address and become the RID of the router automatically.

Question 11

What is the administrative distance of OSPF?

Accepted Answer

The administrative distance (AD) is a very important parameter in a routing protocol. The lower the AD, the more trusted the route. If you have IGRP and OSPF running , by default IGRP routes would be placed in the routing table because IGRP has a lower AD of 100. OSPF has an AD of 110. RIPv1 and RIPv2 both have an AD of 120, and EIGRP is the lowest, at 90.

Question 12

With which network type will OSPF establish router adjacencies but not perform the DR/BDR election process?

Accepted Answer

No DR is assigned on any type of point-to-point link. No DR/BDR is assigned on the NBMA point-to-multipoint due to the hub/spoke topology. DR and BDR are elected on broadcast and non-broadcast multi-access network. Frame relay is a non-broadcast multiaccess (NBMA) network by default.

Question 13

You need the IP address of the devices with which the router has established an adjacency. Also, the retransmit interval and the queue counts for the adjacent routers need to be checked. What command will display the required information?

Accepted Answer

The show ip eigrp neighbors command allows you to check the IP addresses as well as the retransmit interval and queue counts for the neighbors that have established an adjacency.

Question 14

A network administrator needs to configure a router with a distance-vector protocol that allows classless routing. Which of the following satisfies those requirements?

Accepted Answer

In this question, we're calling EIGRP just plain old distance vector. EIGRP is an advanced distance-vector routing protocol, sometimes called a hybrid routing protocol because it uses the characteristics of both distance-vector and link-state routing protocols.

Question 15

You get a call from a network administrator who tells you that he typed the following into his router: Router (config) #router ospf 1 Router (config-router) # network 10.0.0.0. 255. 0.0.0 area 0 He tells you he still can't see any routes in the rout…

Accepted Answer

The administrator typed in the wrong wildcard mask configuration. The wildcard should have been 0.0.0.255 or even 0.255.255.255.

Question 16

Where are EIGRP successor routes stored?

Accepted Answer

Successor routes are going to be in the routing table since they are the best path to a remote network. However, the topology table has a link to each and every network, so the best answer is topology table and routing table. Any secondary route to a remote network is considered a feasible successor, and those routes are found only in the topology table and used as backup routes in case of primary route failure.

Question 17

When is redistribution required for EIGRP?

Accepted Answer

Redistribution is required when more than one EIGRP session or process is running and they are identified with different ASNs Redistribution shares topology information between EIGRP sessions

Question 18

What does a switch do when a frame is received on an interface and the destination hardware address is unknown or not in the filter table?

Accepted Answer

Switches flood all frames that have an unknown destination address. If a device answers the frame, the switch will update the MAC address table to reflect the location of the device.

Question 19

Your switch has a port status LED that is alternating between green and amber. What could this indicate?

Accepted Answer

When you connect to a switch port, at first the link lights are orange/amber, and then they turn green, indicating normal operation. If the link light is blinking, you have a problem.

Question 20

If a switch receives a frame and the source MAC address is not in the MAC address table but the destination address is, what will the switch do with the frame?

Accepted Answer

Since the source MAC address is not in the MAC address table, the switch will add the source address and the port it is connected to into the MAC address table and then forward the frame to the outgoing port.

CISCO Certification Questions