Question 1

There are three possible routes for a router to reach a destination network. The first route is from OSPF with a metric of 782. The second route is from RIPv2 with a metric of 4. The third is from EIGRP with a composite metric of 20514560. Which rou…

Accepted Answer

Only the EIGRP routes will be placed in the routing table because it has the lowest administrative distance (AD), and that is always used before metrics.

Question 2

What is the purpose of Spanning Tree Protocol in a switched LAN?

Accepted Answer

The Spanning Tree Protocol (STP) was designed to stop layer 2 loops. All Cisco switches have the STP on by default.

Question 3

Which command will configure a switch port to use the IEEE standard method of inserting VLAN membership information into Ethernet frames?

Accepted Answer

If you are on a 2950 switch, then the interface command is just swichport mode trunk since the 2050 can only run the IEEE 802.1q version. However, a 3550 can run both ISL and 802.1q, so you must also use the encapsulation command. The argument to choose 802.1q for a trunking protocol is dot1q.

Question 4

You need to stop DoS attacks in real time and have a log of anyone who has tried to attack your network. What should you do your network?

Accepted Answer

Implementing Intrusion Detection Service and Intrusion prevention Service (IDS/IPS) will help notify you and stop attacks in real time.

Question 5

How many non- overlapping channels are available with 802.11b?

Accepted Answer

The IEEE 802.11b standard provides three non-overlapping channels.

Question 6

You want to ping the loopback address of your IPv6 local host. What will you type?

Accepted Answer

The loop back address with IPv4 is 127.0.0.1 . With IPv6, that address is ::1

Question 7

You need to configure a router for a Frame Relay connection to a non-Cisco router. Which of the following commands will prepare the WAN interface of the router for this connection?

Accepted Answer

If you have a Cisco router on one side of a Frame Relay network and a non-Cisco router on the otherside, you would need to use the Frame Relay encapsulation type of IETF. The default is Cisco encapsulation, which means that a Cisco router must be on both sides of the Frame Relay PVC.

Question 8

How should a router that is being used in a Frame Relay network be configured to keep split horizon issues from preventing routing updates

Accepted Answer

If you have a serial port configured with multiple DLCIs connected to multiple remote sites, split horizon rules stop route updates received on an interface from being sent out the same interface. By creating subinterfaces for each PVC, you can avoid the split horizon issues when using Frame Relay.

Question 9

You are the network administrator and are given the tasks to plan for the future expansion of the network. You decide to subnet the current network of 172.15.0.0. What will be the subnet mask be if every subnet has to allocate 500 hosts.

Accepted Answer

Explanation: The requirement of having to allocate 500 hosts on each subnet can be achieved by the following: 2^9 = 512. So deducting the broadcast and network address we have 510 possible hosts on each subnet. We used 9 bits to allocate the hosts, this leaves us 7 bits for possible subnets. Those 7 bits in binary is 1111 1110 or 254 in decimal.

Question 10

Given the following network range 192.168.0.0/24. We want minimum 50 hosts on each of the available subnets. What will be the subnet mask?

Accepted Answer

Explanation: 50 hosts require 6 bits of the last octet giving us 64 -2 = 62 possible hosts this satisfies our requirement and leaves us 2 bits over for the subnets. The default mask is /24 or 255.255.255.0 adding the 2 bits for the subnets it becomes 255.255.255.192 or /26

Question 11

When data is encapsulated , which is the correct order?

Accepted Answer

The encapsulation method is data, segment, packet, frame, bit.

CISCO Certification Questions