Cisco Network Administration - Chapter 2

Class C

What type of class address is this? 192.168.3.55

default route

What type of route allows a router to forward packets even though its routing table contains no specific route to the destination network?

default static routes

What type of route would you configure on stub routers?

Classless protocols

What type of routing protocols support things like /23?

fully specified static route

What type of static route is created when the next-hop IP address and exit interface are specified?

When the subnetmask is less than the class you are using

When is a summary route considered a supernet?

when its physically connected to the network, no shut, ip sub mask , plugged in, proper configuration

When would a directly connected route show up in the routing table?

Router1(config)# ipv6 route 2001:db8:acad:1::/32 2001:db8:acad:6::2 200

Which IPv6 static route would serve as a backup route to a dynamic route learned through OSPF?

ipv6 route ::/0 2001:db8:acad:2::a

Which command would create a valid IPv6 default route?

default

A ________________ route is a route that matches all packets and is used by the router if a packet does not match any other, more specific route in the routing table. A _____________ route can be dynamically learned or statically configured.

172.16.0.0/24

A company has several networks with the following IP address requirements: IP phones - 50 PCs - 70 IP cameras - 10 wireless access points - 10 network printers - 10 network scanners - 2 Which block of addresses would be the minimum to accommodate all of these devices if each type of device was on its own network?

encapsulates the packet into a frame for the WAN link and forwards the packet out the S0/1/0 interface

A network administrator enters the following command into Router1: ip route 192.168.0.0 255.255.255.0 S0/1/0. Router1 then receives a packet that is destined for 192.168.0.22/24. After finding the recently configured static route in the routing table, what does Router1 do next to process the packet?

show ip interface brief

A network administrator has entered a static route to an Ethernet LAN that is connected to an adjacent router. However, the route is not shown in the routing table. Which command would the administrator use to verify that the exit interface is up?

ping show ip interface brief

A network administrator notices that a correctly entered static route is not in the routing table. What two router commands would an administrator use to determine if the exit interface was up and the next hop address is available? (Choose two.)

Stub

A network with only one way out and one way in? (uses default static route)

ipv6 route 2001:db8:10:12::/64 S0/0/1

Open the PT Activity. Perform the tasks in the activity instructions and then answer the question. What IPv6 static route can be configured on router R1 to make a fully converged network?

The static route to network 192.168.2.0 is misconfigured on Router1.​

Open the PT Activity. Perform the tasks in the activity instructions and then answer the question. Why are the pings from PC0 to Server0 not successful?

Park(config)# ip route 0.0.0.0 0.0.0.0 192.168.14.1 Alta(config)# ip route 10.0.234.0 255.255.255.0 192.168.14.2 Alta(config)# ip route 0.0.0.0 0.0.0.0 s0/0/0

Refer to the exhibit. Which set of commands will configure static routes that will allow the Park and the Alta routers to a) forward packets to each LAN and b) direct all other traffic to the Internet?

S 172.16.1.0 [1/0] via 172.16.2.2

The network administrator configures the router with the ip route 172.16.1.0 255.255.255.0 172.16.2.2 command. How will this route appear in the routing table?

dynamic routing

There are disadvantages to __________________. _____________________________ requires knowledge of additional commands. It is also less secure than static routing because the interfaces identified by the routing protocol send routing updates out.

single static

To reduce the number of routing table entries, multiple static routes can be summarized into a __________________ route if:

less bandwidth used for stub networks networks with a single route to a destination

What are 3 characteristics of static routes?

Connect to a specific network. Provide a Gateway of Last Resort for a stub network. Reduce the number of routes advertised by summarizing several contiguous networks as one static route. Create a backup route in case a primary route link fails

What are the four reasons to use static routes?

Static routing is more secure because it does not advertise over the network. Static routing uses fewer router resources than dynamic routing.

What are two advantages of static routing over dynamic routing? (Choose two.)

0.0.0.0 - 127.255.255.255

Give the Classful Address Ranges for the following: Class A

128.0.0.0 - 191.255.255.255

Give the Classful Address Ranges for the following: Class B

192.0.0.0 - 239.255.255.255

Give the Classful Address Ranges for the following: Class C

Clock rate - clock rate not set or plugged in wrong

1What is a common issues with serial link?

find best path to send packets connect to multiple ip networks

9. What are two functions of a router?

(config)# ip route 192.168.10.0 255.255.255.0 95

Give the command syntax to configure an IPv4 floating static default route.

supernet

199.2.1.127/23 is called what?

100

An administrator issues the ipv6 route 2001:db8:acad:1::/32 gigabitethernet0/0 2001:db8:acad:6::1 100 command on a router. What administrative distance is assigned to this route?

floating static

Another type of static route is a ________________________ route. ____________________ routes are static routes that are used to provide a backup path to a primary static or dynamic route, in the event of a link failure.

static

Both IPv4 and IPv6 support the configuration of _______________ routes. __________________ routes are useful when connecting to a specific remote network.

Manually shut down the router interface used as a primary route.

Consider the following command: ip route 192.168.10.0 255.255.255.0 10.10.10.2 5 How would an administrator test this configuration?

a static route to the 192.168.10.0/24 network

Consider the following command: ip route 192.168.10.0 255.255.255.0 10.10.10.2 5 Which route would have to go down in order for this static route to appear in the routing table?

a static route to the 192.168.10.0/24 network

Consider the following command: ip route 192.168.10.0 255.255.255.0 10.10.10.2 5 Which route would have to go down in order for this static route to appear in the routing table?

floating

Fill in the blank. A _____________ static route can be used to provide a backup route to a dynamically learned route.

stub

Fill in the blank. A _______________________________ network is a network that is accessed by a single route.

192.168.2.2

Fill in the blank. Refer to the exhibit. On R1, the command to configure a static route to network 172.16.2.0 by specifying the next-hop IP address is ip route 172.16.2.0 255.255.255.0 .​

16382

How many hosts does a /18 support?

8190

How many hosts does a /19 support?

2046

How many hosts does a /21 support?

1022

How many hosts does a /22 support?

510

How many hosts does a /23 support?

remove bad route and replace with a good one

If I have an incorrect static route how can I fix it?

Run no shutdown command

If an interface says it administratively down what do you do?

fully specified static

In a ____________________________ route, both the exit interface and the next-hop IP address are specified.

Border(config)# ip route 0.0.0.0 0.0.0.0 s0/0/1

Refer to the exhibit. The network administrator needs to configure a default route on the Border router. Which command would the administrator use to configure a default route that will require the least amount of router processing when forwarding packets?

ip route 0.0.0.0 0.0.0.0 s0/0/0 ip route 0.0.0.0 0.0.0.0 s0/1/0 10

Refer to the exhibit. The network engineer for the company that is shown wants to use the primary ISP connection for all external connectivity. The backup ISP connection is used only if the primary ISP connection fails. Which set of commands would accomplish this goal?

send the packet out interface Serial0/0/1

Refer to the exhibit. The routing table for R2 is as follows: Gateway of last resort is not set 10.0.0.0/30 is subnetted, 2 subnets C 10.0.0.0 is directly connected, Serial0/0/0 C 10.0.0.4 is directly connected, Serial0/0/1 192.168.10.0/26 is subnetted, 3 subnets S 192.168.10.0 is directly connected, Serial0/0/0 C 192.168.10.64 is directly connected, FastEthernet0/0 S 192.168.10.128 [1/0] via 10.0.0.6 What will router R2 do with a packet destined for 192.168.10.129?

R1 needs a static route to the R2 LAN.

Refer to the exhibit. The small company shown uses static routing. Users on the R2 LAN have reported a problem with connectivity. What is the issue?

ipv6 route 2001:db8:1:4::/64 2001:db8:1:3::2

Refer to the exhibit. What command would be used to configure a static route on R1 so that traffic from both LANs can reach the 2001:db8:1:4::/64 remote network?

Configure a static default route from R1 to Edge, a default route from Edge to the Internet, and a static route from Edge to R1.

Refer to the exhibit. What routing solution will allow both PC A and PC B to access the Internet with the minimum amount of router CPU and network bandwidth utilization?

A(config)# no ip route 10.0.0.0 255.0.0.0 172.16.40.2 A(config)# ip route 10.0.0.0 255.0.0.0 192.168.1.2

Refer to the exhibit. What two commands will change the next-hop address for the 10.0.0.0/8 network from 172.16.40.2 to 192.168.1.2? (Choose two.)

R1(config)# ipv6 route ::/0 G0/1 fe80::2

Refer to the exhibit. Which default static route command would allow R1 to potentially reach all unknown networks on the Internet?

A(config)# ip route 192.168.4.0 255.255.255.0 192.168.3.2

Refer to the graphic. Which command would be used on router A to configure a static route to direct traffic from LAN A that is destined for LAN C?

172.16.0.0/12

Summarize the network 172.16.0.0/14, 172.20.0.0/15, 172.22.0.0/15, and 172.24.0.0/13.

::/0

Syntax to configure ipv6 default route?

Static routing is more secure. Static routing uses less router processing and bandwidth.

What are two reasons why an administrator might choose to use static routing rather than dynamic routing? (Choose two.)

Class A

What class type of address is this? 10.0.0.1

Class B

What class type of address is this? 172.16.99.2

HQ(config)# interface serial 0/1/0 HQ(config-if)# shutdown HQ(config-if)# end HQ# show ip route

What command, or set of commands, would be used to determine if the following configuration on router HQ works as designed? ip route 0.0.0.0 0.0.0.0 serial 0/0/0 10 ip route 0.0.0.0 0.0.0.0 serial 0/1/0

Ip route with wrong next hop

What could cause this configuration to not work?

The static route is removed from the routing table.

What happens to a static route entry in a routing table when the outgoing interface associated with that route goes into the down state?

It identifies the gateway IP address to which the router sends all IP packets for which it does not have a learned or static route.

What is a characteristic of a default static route? ​

It identifies the gateway IP address to which the router sends all IP packets for which it does not have a learned or static route.

What is a characteristic of a static route that matches all packets?

Administrative distance on end of command and need to be higher

What is require for floating static route?

ip route 209.165.200.228 255.255.255.248 10.0.0.1 120

What is the correct syntax of a floating static route?

0.0.0.0 0.0.0.0

What network address and subnet mask combination would be used to create a default static route that matches any IPv4 destination?

the interface ID exit interface the IP address of the next-hop neighbor

What two pieces of information are needed in a fully specified static route to eliminate recursive lookups? (Choose two.)

Route summarization

__________________________________ (also called route aggregation or supernetting) can reduce the number of routes that a router must maintain, because it is a method of representing a series of network numbers in a single summary address.

ipv6 route 2001:db8:cafe:1::/56 2001:db8:1000:10::1

Which static route statement shows a recursive IPv6 static route?

ping show ip route show ip interface brief

Which three IOS troubleshooting commands can help to isolate problems with a static route? (Choose three.)

directly connected static route

Which type of static route that is configured on a router uses only the exit interface?

to be used as a backup route

Why would a floating static route be configured with an administrative distance that is higher than the administrative distance of a dynamic routing protocol that is running on the same router?

to reduce the size of the routing table

Why would a summarized static route be configured on a router?

Static routing

___________________ provides some advantages over dynamic routing, including: ________________ are not advertised over the network, resulting in better security. ________________ use less bandwidth than dynamic routing protocols, no CPU cycles are used to calculate and communicate routes. The path a ________________ uses to send data is known.

Supernetting

______________________ allows one routing table entry to represent an aggregation of networks much like one area code represents an aggregation of telephone numbers in an area.

Static

__________________________ routing has the following disadvantages: Initial configuration and maintenance is time-consuming. Configuration is error-prone, especially in large networks. Administrator intervention is required to maintain changing route information. Does not scale well with growing networks; maintenance becomes cumbersome. Requires complete knowledge of the whole network for proper implementation.

Dynamic

__________________________ routing protocols work well in any type of network consisting of several routers. They are scalable and automatically determine better routes if there is a change in the topology. Although there is more to the configuration of dynamic routing protocols, they are simpler to configure than static routing in a large network.