Introduction to IP Routing

Question 1

Which is not a routing protocol?

RIP

RIPv2

RIPv3

Answer 1

RIPv3

Yep, you got it. RIP, RIPv2, and EIGRP are all examples of routing protocols

Question 2

Which of these best describes dynamic routing?

All network addresses must be hand-typed into the routing table.

Only a portion of the network address must be hand-typed into the routing table.

Routing tables are updated automatically when changes occur in the network.

Answer 2

Routing tables are updated automatically when changes occur in the network.

In dynamic routing, routers update each other about all the networks they know about and place this information into the routing table. This is possible because a protocol on one router communicates with the same protocol running on neighbor routers. If changes occur in the network, a dynamic routing protocol automatically informs all routers about the event

Question 3

Which is true regarding dynamic routing?

Static routes are automatically added to the routing table but dynamic routes must be added by hand.

You must use a DNS and WINS server when configuring dynamic routing.

Dynamic routes are automatically added to the routing table.

Answer 3

Dynamic routes are automatically added to the routing table.

Dynamic routing scales well in large networks and routes are automatically added into the routing table. Static routing is done by hand, one route at a time into each router

Question 4

Which of the following is true for MAC addresses?

MAC addresses are never local on the LAN and always pass through a router.

MAC addresses are always local on the LAN and never go through or past a router.

MAC addresses will always be the IP address of Fa0/0 interface.

Answer 4

MAC addresses are always local on the LAN and never go through or past a router.

Media Access Control (MAC) addresses are always local on the LAN and never go through and past a router

Question 5

What is it called when protocols update their forwarding tables after changes have occurred?

Name resolution

Routing

Convergence

Answer 5

Convergence

Routing convergence is the time required by the routing protocols to update the routing tables (forwarding tables) on all routers in the network

Question 6

What command would be used to view the ARP cache on your host?

C:\ >show ip arp

C:\ >show protocols

C:\ >arp -a

Answer 6

C:\ >arp -a

The arp -a command will show the ARP cache on your host

Question 7

What happens when a router receives a packet for a network that isn’t listed in the routing table?

It forwards the packet to the next available router.

It holds the packet until the address is updated in the routing table.

The router will use RIP to inform the host that it can’t send the packet.

None of the above.

Answer 7

None of the above.

Hope you answered D! A router will not send a broadcast looking for the remote network—the router will discard the packet

Question 8

Which of the following is not a distance vector protocol?

RIPv1

RIPv2

OSPF

Answer 8

OSPF

RIPv1 and 2 and IGRP are all distance vector (DV) protocols. Routers using a DV protocol send all or parts of their routing table in a routing-update message at a regular interval to each of their neighbor routers

Question 9

Which two of the following are link state protocols?

RIPv1

RIPv2

OSPF

IS-IS

Answer 9

OSPF

IS-IS

Open Shortest Path First (OSPF) and Intermediate System-to-Intermediate System (IS-IS) are link state (LS) routing protocolsOpen Shortest Path First (OSPF) and Intermediate System-to-Intermediate System (IS-IS) are link state (LS) routing protocols

Question 10

Which of the following is a hybrid routing protocol?

RIPv2

EIGRP

IS-IS

Answer 10

EIGRP

The only protocol you could select is Enhanced Interior Gateway Routing Protocol (EIGRP)

Question 11

What does the acronym IGRP stand for?

Interior Gateway Routing Protocol

Inside Gateway Redundancy Protocol

Interior Group Reliability Protocol

Answer 11

Interior Gateway Routing Protocol

Interior Gateway Routing Protocol is a distance vector (DV) interior gateway protocol

Question 12

What EGP protocol is used on the Internet?

GGP

EGP

BGP

Answer 12

BGP

Border Gateway Protocol (BGP) is the most popular choice for ISPs or really large corporations

Question 13

What are the two categories of IGP protocols?

Link state

Static

Distance vector

EGP

Answer 13

Link state

Distance vector

Distance vector (DV) and link state (LS) are the two routing protocols to remember

Question 14

What two pieces of information does a router require to make a routing decision? (Choose two.)

Destination network (address)

Destination MAC address

Application layer protocol

Neighbor router

Answer 14

Destination network (address)

Neighbor router

A frame uses MAC addresses to send a packet on the LAN. The frame will take the packet to either a host on the LAN or a router’s interface if the packet is destined for a remote network

Question 15

Where does a frame have to carry a packet if it is destined for a remote network?

Default gateway

Neighbor host

Switch

Answer 15

Default gateway

I hope you said A! Packets specifically have to be carried to a router in order to be routed through a network

Question 16

Where along the IP routing process does a packet get changed?

Router

Host A

Destination device

Answer 16

Destination device

Remember that the frame changes at each hop but that the packet is never changed in any way until it reaches the destination device

Question 17

When all routers in a network agree about the path from one point to another, the network is said to be what?

Static

Secure

Converged

Answer 17

Converged

When the routing tables are complete because they include information about all networks in the internetwork, they are considered converged

Question 18

What type of request must a client send if it does not know the destination MAC address?

ARP broadcast

Multicast

ICMP redirect

Answer 18

ARP broadcast

This is step 6 in the IP routing process. If the hardware address isn’t in the ARP cache of the host, an ARP broadcast is sent out onto the local network to search for the hardware address

Question 19

You need to perform maintenance on a router in your corporate office. It is important that the network does not go down. What can you do to accomplish your goal?

Configure BGP on the router.

Implement NAT on the router.

Configure on the router a static route that temporarily reroutes traffic through another office.

Answer 19

Configure on the router a static route that temporarily reroutes traffic through another office.

The best answer would be to reroute traffic using a temporary static route until the maintenance is complete on the router

Question 20

When are you most likely to see a Request Timed Out message?

When an unknown error has occurred

When you have used the arp -a command incorrectly

When a known error has occurred

Answer 20

When an unknown error has occurred

You are most likely to see a Request Timed Out message when (if) a packet is lost on the way back to the originating host for an unknown error. Remember, if the error occurs because of a known issue, you are likely to see a Destination Unreachable message