Advantage of static routing

Advantage of static routing

What command was used to generate the following output?
Codes: L - local, C - connected, S - static,
[output cut]
10.0.0.0/8 is variably subnetted, 6 subnets, 4 masks
C 10.0.0.0/8 is directly connected, FastEthernet0/3
L 10.0.0.1/32 is directly connected, FastEthernet0/3
C 10.10.0.0/16 is directly connected, FastEthernet0/2
L 10.10.0.1/32 is directly connected, FastEthernet0/2
C 10.10.10.0/24 is directly connected, FastEthernet0/1
L 10.10.10.1/32 is directly connected, FastEthernet0/1
S* 0.0.0.0/0 is directly connected, FastEthernet0/0

 

·         show ip route The ip route command is used to display the routing table of a router.

 

You are viewing the routing table and you see an entry 10.1.1.1/32. What legend code
would you expect to see next to this route?
A. C
B. L
C. S
D. D

 

·         B. In the new 15 IOS code, Cisco defines a different route called a local route. Each has
a /32 prefix defining a route just for the one address.

 

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.

 

·         A, B. Although option 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.

 

Using the output shown, what protocol was used to learn the MAC address for
172.16.10.1?
Interface: 172.16.10.2 --- 0x3
Internet Address Physical Address Type
172.16.10.1 00-15-05-06-31-b0 dynamic
A. ICMP
B. ARP
C. TCP
D. UDP

 

·         B. This mapping was learned dynamically which means it was learned
through ARP.

 

Which of the following is called an advanced distance-vector routing protocol?
A. OSPF
B. EIGRP
C. BGP
D. RIP

 

·         B. Hybrid protocols use aspects of both distance vector and link state—for example,
EIGRP. Although be advised that Cisco typically just calls EIGRP an advanced distance
vector routing protocol. Do not be mislead by the way the question is worded. Yes, I know
that MAC addresses are not in a packet. You must read the question for understanding of
what they are really asking.

 

When a packet is routed across a network, the ______________ in the packet changes at
every hop while the ____ does not.
A. MAC address, IP address
B. IP address, MAC address
C. Port number, IP address
D. IP address, port number

 

·         Since the destination MAC address is different at each hop, it must keep changing.
The IP address which is used for the routing process does not.

 

. 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.

 

·         B, E. Classful routing means that all hosts in the internetwork use the same mask and
that only default masks are in use. Classless routing means that you can use variable
length subnet masks (VLSMs).

 

Which two of the following are true regarding the distance-vector and link-state routing
protocols? (Choose two.)
A. Link state sends its complete routing table out of all active interfaces at periodic
time intervals.
B. Distance vector sends its complete routing table out of all active interfaces at 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

 

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

 

When a router looks up the destination in the routing table for every single packet it is
called _____________ .
A. dynamic switching
B. fast switching
C. process switching
D. Cisco Express Forwarding

 

·         C. This is how most people see routers, and certainly they could do this type of plain
ol' packet switching in 1990 when Cisco released their very first router and traffic was
seriously slow, but not in today's networks! This process involves looking up every destination
in the routing table and finding the exit interface for every packet.

 

What type(s) of route is the following? Choose all that apply.
S* 0.0.0.0/0 [1/0] via 172.16.10.5
A. Default
B. Subnetted
C. Static
D. Local

 

·         A, C. The S* shows that this is a candidate for default route and that it was configured
manually.

 

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

 

·         B. RIP has an administrative distance (AD) of 120, while EIGRP has an administrative
distance of 90, so the router will discard any route with a higher
AD than 90 to that same network.

 

Which of the following is NOT an advantage of static routing?
A. Less overhead on the router CPU
B. No bandwidth usage between routers
C. Adds security
D. Recovers automatically from lost routes

 

·         D. Recovery from a lost route requires manual intervention by a human to replace the
lost route.

 

What metric does RIPv2 use to find the best path to a remote network?
A. Hop count
B. MTU
C. Cumulative interface delay
D. Load
E. Path bandwidth value

 

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

 

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

 

·         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 of interface
FastEthernet 0/0, which is the source LAN from which the packet originated.

 

 

If your routing table has a static, an RIP, and an EIGRP 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. EIGRP route
E. They will all load-balance.

 

·         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 dynamically learned route.
EIGRP has an administrative distance of 90, and RIP has an administrative distance
of 120, by default.

 

Which of the following is an EGP?
A. RIPv2
B. EIGRP
C. BGP
D. RIP

 

·         C. BGP is the only EGP listed.

 

Which of the following is an advantage of static routing?
A. Less overhead on the router CPU
B. No bandwidth usage between routers
C. Adds security
D. Recovers automatically from lost routes

 

·         D. Recovery from a lost route requires manual intervention by a human to replace
the lost route. The advantages are less overhead on the router and network, as well
as more security.

 

What command produced the following output?
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 192.168.10.1 YES manual up up
FastEthernet0/1 unassigned YES unset administratively down down
Serial0/0/0 172.16.10.2 YES manual up up
Serial0/0/1 unassigned YES unset administratively down down
A. show ip route
B. show interfaces
C. show ip interface brief
D. show ip arp

 

·         C. The show ip interface brief command displays a concise summary of the interfaces.

 

In the following command what does the 150 at the end of the command mean?
Router(config)#ip route 172.16.3.0 255.255.255.0 192.168.2.4 150
A. Metric
B. Administrative distance
C. Hop count
D. Cost

 

·         B. The 150 at the end changes the default administrative distance (AD) of 1 to 150.