Ip Routing Part 1

Front 1

Why MAC addresses are always local?

Back 1

A MAC (hardware) address will only be
used on a local LAN. It will never pass a router’s interface

Front 2

Why a frame carries a packet to only two places?

Back 2

A frame uses MAC (hardware)
addresses to send a packet on a 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

Front 3

How to verify RIP routing

Back 3

The show ip route command will provide you with
the contents of the routing table. An R on the left side of the table indicates a RIP-found route.
The debug ip rip command will show you RIP updates being sent and received on your
router. If you see a route with a metric of 16, that route is considered down.

Front 4

What isthe differences between RIPv1 and RIPv2?

Back 4

RIPv1 sends broadcasts every 30 seconds
and has an AD of 120. RIPv2 sends multicasts (224.0.0.9) every 30 seconds and also has
an AD of 120. RIPv2 sends subnet mask information with the route updates, which allows it
to support classless networks and discontiguous networks. RIPv2 also supports authentication
between routers and RIPv1 does not.

Front 5

From the SDM you have just enabled RIP and the passive-interface box for your serial
interface is unchecked. What does this mean?

Back 5

This serial interface will send RIP Updates.

Front 6

What command will you type to create a default route to 172.16.40.1?

Back 6

(config)#ip route 0.0.0.0 0.0.0.0 172.16.40.1

Front 7

If you are using default routing, what command must also be used?

Back 7

(config)#ip classless

Front 8

You would use a default route on which type of network?

Back 8

Stub Networks. A network with single gateway router connected to ISP.

Front 9

To see the routing table on your router, what command will you use?

Back 9

#show ip route

Front 10

When creating a static or default route, you don’t have to use the next-hop IP address; you
can use the

Back 10

Ypu can use exit interface instead next-hop IP address.

Front 11

When creating a static or default route, you don’t have to use the next-hop IP address; you
can use the

Back 11

False. You Need to know IP address. MAC addressess will not pass routers.

Front 12

If you have a DCE serial interface, what command must you enter for that interface
to work?

Back 12

Router(config-if)#clock rate speed

Front 13

True/False: To reach a destination host, you must know the IP address of the remote host.

Back 13

True. Router will send packets to an IP address of the remote host.

Front 14

That is the commands used to turn RIP routing on in a router and advertise network
10.0.0.0.

Back 14

(config)#router rip
(config-router)#network 10.0.0.0

Front 15

Write the commands to stop a router from propagating RIP information out serial 1.

Back 15

Router rip, passive-interface s1

Front 16

What works with triggered updates to help stop routing loops in distance-vector networks?

Back 16

Holddown timers

Front 17

What stops routing loops in distance-vector networks by sending out a maximum hop
count as soon as a link fails?

Back 17

Route poisoning

Front 18

What stops routing loops in distance-vector networks by not resending information
learned on an interface out that same interface?

Back 18

Split horizon

Front 19

What command is used to send RIP routing updates as they are sent and received on the
router to the console session?

Back 19

debug ip rip

Front 20

Network 206.143.5.0 was assigned to the Acme Company to connect to its ISP. The administrator
of Acme would like to configure one router with the commands to access the Internet.
Which commands could be configured on the Gateway router to allow Internet access to the
entire network? (Choose two.)

A. Gateway(config)#ip route 0.0.0.0 0.0.0.0 206.143.5.2
B. Gateway(config)#router rip
C. Gateway(config-router)#network 206.143.5.0
D. Gateway(config)#router rip
E. Gateway(config-router)#network 206.143.5.0 default
F. Gateway(config)#ip route 206.143.5.0 255.255.255.0 default
G. Gateway(config)#ip default-network 206.143.5.0

Back 20

A. Gateway(config)#ip route 0.0.0.0 0.0.0.0 206.143.5.2

G. Gateway(config)#ip default-network 206.143.5.0

Front 21

What command is used to stop RIP routing updates from exiting out an interface but still allow
the interface to receive RIP route updates?
A. Router(config-if)#no routing
B. Router(config-if)#passive-interface
C. Router(config-router)#passive-interface s0
D. Router(config-router)#no routing updates

Back 21

C. The (config-router)#passive-interface command stops updates from being sent out
an interface, but route updates are still received.

Front 22

Which of the following statements are true regarding the command ip route 172.16.4.0
255.255.255.0 192.168.4.2? (Choose two.)
A. The command is used to establish a static route.
B. The default administrative distance is used.
C. The command is used to configure the default route.
D. The subnet mask for the source address is 255.255.255.0.
E. The command is used to establish a stub network.

Back 22

A, B. Although answer D almost seems right, it is not; the mask is the mask used on the remote
network, not the source network. Since there is no number at the end of the static route, it is
using the default administrative distance of 1.

Front 23

Which of the following is true regarding the following output? (Choose two.)
04:06:16: RIP: received v1 update from 192.168.40.2 on Serial0/1
04:06:16: 192.168.50.0 in 16 hops (inaccessible)
04:06:40: RIP: sending v1 update to 255.255.255.255 via
FastEthernet0/0 (192.168.30.1)
04:06:40: RIP: build update entries
04:06:40: network 192.168.20.0 metric 1
04:06:40: network 192.168.40.0 metric 1
04:06:40: network 192.168.50.0 metric 16
04:06:40: RIP: sending v1 update to 255.255.255.255 via Serial0/1
(192.168.40.1)
A. There are three interfaces on the router participating in this update.
B. A ping to 192.168.50.1 will be successful.
C. There are at least two routers exchanging information.
D. A ping to 192.168.40.2 will be successful.

Back 23

C, D. The route to 192.168.50.0 is unreachable and only interfaces s0/1 and FastEthernet
0/0 are participating in the RIP update. Since a route update was received, at least two routers
are participating in the RIP routing process. Since a route update for network 192.168.40.0 is
being sent out f0/0 and a route was received from 192.168.40.2, we can assume a ping to that
address will be successful.

Front 24

What is split horizon?

Back 24

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

Front 25

Which statement is true regarding classless routing protocols? (Choose two.)
A. The use of discontiguous networks is not allowed.
B. The use of variable length subnet masks is permitted.
C. RIPv1 is a classless routing protocol.
D. IGRP supports classless routing within the same autonomous system.
E. RIPv2 supports classless routing

Back 25

B, E. Classful routing means that all hosts in the internetwork use the same mask. Classless
routing means that you can use Variable Length Subnet Masks (VLSMs) and can also support
discontiguous networking.

Front 26

Which two of the following are true regarding the distance-vector and link-state routing
protocols?
A. Link state sends its complete routing table out all active interfaces on periodic time
intervals.
B. Distance vector sends its complete routing table out all active interfaces on periodic
time intervals.
C. Link state sends updates containing the state of its own links to all routers in the
internetwork.
D. Distance vector sends updates containing the state of its own links to all routers in the
internetwork

Back 26

B, C. The distance-vector routing protocol sends its complete routing table out all active interfaces
at periodic time intervals. Link-state routing protocols send updates containing the state
of its own links to all routers in the internetwork.

Front 27

Which command displays RIP routing updates?
A. show ip route
B. debug ip rip
C. show protocols
D. debug ip route

Back 27

B. debug ip rip

Front 28

What does RIPv2 use to prevent routing loops? (Choose two.)
A. CIDR
B. Split horizon
C. Authentication
D. Classless masking
E. Holddown timers

Back 28

Split horizon

Holddown timers

Front 29

A network administrator views the output from the show ip route command. A network that is
advertised by both RIP and IGRP appears in the routing table flagged as an IGRP route. Why is the
RIP route to this network not used in the routing table?
A. IGRP has a faster update timer.
B. IGRP has a lower administrative distance.
C. RIP has a higher metric value for that route.
D. The IGRP route has fewer hops.
E. The RIP path has a routing loop.

Back 29

B. IGRP has a lower administrative distance.

Front 30

You type debug ip rip on your router console and see that 172.16.10.0 is being advertised
to you with a metric of 16. What does this mean?

Back 30

The route is inaccessible.

Front 31

IGRP uses which of the following as default parameters for finding the best path to a remote
network? (Choose two.)
A. Hop count
B. MTU
C. Cumulative interface delay
D. STP
E. Path bandwidth value

Back 31

C, E. IGRP uses bandwidth and delay of the line, by default, to determine the best path to a
remote network. Delay of the line can sometimes be called the cumulative interface delay.

Front 32

The Corporate router receives an IP packet with a source IP address of 192.168.214.20 and a
destination address of 192.168.22.3. Looking at the output from the Corporate router, what
will the router do with this packet?
Corp#sh ip route
[output cut]
R 192.168.215.0 [120/2] via 192.168.20.2, 00:00:23, Serial0/0
R 192.168.115.0 [120/1] via 192.168.20.2, 00:00:23, Serial0/0
R 192.168.30.0 [120/1] via 192.168.20.2, 00:00:23, Serial0/0
C 192.168.20.0 is directly connected, Serial0/0
C 192.168.214.0 is directly connected, FastEthernet0/0

A. The packet will be discarded.
B. The packet will be routed out the S0/0 interface.
C. The router will broadcast looking for the destination.
D. The packet will be routed out the Fa0/0 interface.

Back 32

A. Since the routing table shows no route to the 192.168.22.0 network, the router will discard
the packet and send an ICMP destination unreachable message out interface FastEthernet 0/0,
which is the source LAN where the packet originated from.

Front 33

If your routing table has a static, a RIP, and an IGRP route to the same network, which route
will be used to route packets by default?
A. Any available route
B. RIP route
C. Static route
D. IGRP route
E. They will all load-balance.

Back 33

C. Static routes have an administrative distance of 1 by default. Unless you change this, a static
route will always be used over any other found route. IGRP has an administrative distance of
100, and RIP has an administrative distance of 120, by default.

Front 34

You have the following routing table. Which of the following networks will not be placed in
the neighbor routing table?
R 192.168.30.0/24 [120/1] via 192.168.40.1, 00:00:12, Serial0
C 192.168.40.0/24 is directly connected, Serial0
172.16.0.0/24 is subnetted, 1 subnets
C 172.16.30.0 is directly connected, Loopback0
R 192.168.20.0/24 [120/1] via 192.168.40.1, 00:00:12, Serial0
R 10.0.0.0/8 [120/15] via 192.168.40.1, 00:00:07, Serial0
C 192.168.50.0/24 is directly connected, Ethernet0
A. 172.16.30.0
B. 192.168.30.0
C. 10.0.0.0
D. All of them will be placed in the neighbor routing table.

Back 34

C. The network 10.0.0.0 cannot be placed in the next router’s routing table because it
already is at 15 hops. One more hop would make the route 16 hops, and that is not valid
in RIP networking.

Front 35

Two connected routers are configured 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?
A. The updated information will be added to the existing routing table.
B. The update will be ignored and no further action will occur.
C. The updated information will replace the existing routing table entry.
D. The existing routing table entry will be deleted from the routing table and all routers will
exchange routing updates to reach convergence.

Back 35

B. 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, then the router will choose the one route with the
lowest metrics, or in RIP’s case, hop count.

Front 36

What is route poisoning?
A. It sends back the protocol received from a router as a poison pill, which stops the
regular updates.
B. It is information received from a router that can’t be sent back to the originating router.
C. It prevents regular update messages from reinstating a route that has just come up.
D. It describes when a router sets the metric for a downed link to infinity.

Back 36

D. Another way to avoid problems caused by inconsistent updates and to stop network loops
is route poisoning. When a network goes down, the distance-vector routing protocol initiates
route poisoning by advertising the network with a metric of 16, or unreachable (sometimes
referred to as infinite).

Front 37

Which of the following is true regarding RIPv2?
A. It has a lower administrative distance than RIPv1.
B. It converges faster than RIPv1.
C. It has the same timers as RIPv1.
D. It is harder to configure than RIPv1.

Back 37

C. RIPv2 is pretty much just like RIPv1. It has the same administrative distance and timers and
is configured just like RIPv1.