OSPF Neighbor Sim

We don’t have enough information about this sim to make a complete solution but here is some information from the candidates about this sim so far:

Topology:

RIPv2 SIM

Question

TUT Company recently installed a new router in their office. Complete the network installation by performing the initial router configurations and configuring RIPv2 routing using the router command line interface (CLI) on the R2-TUT.

Name of the router is R2-TUT
Enable-secret password is Sec@ret
The password to access user EXEC mode using the console is Sec@ret2
The password to allow telnet access to the router is Sec@ret3
IPV4 addresses must be configured as follows:
Ethernet network 213.123.20.128/27 – router has last assignable host address in subnet
Serial network is 200.0.1.16/28 – router has last assignable host address in the subnet. Interfaces should be enabled.
Router protocol is RIPv2

Answer and Explanation

1) Name the router:

Router>enable
Router#configure terminal
Router(config)#hostname R2-TUT

2) Set secret password:

R2-TUT(config)# enable secret Sec@ret

3) Set password for the console:

R2-TUT(config)#line console 0
R2-TUT(config-line)#password Sec@ret2
R2-TUT(config-line)#login
R2-TUT(config-line)#exit

4) Set the Telnet password:

R2-TUT(config)#line vty 0 4
R2-TUT(config-line)#password Sec@ret3
R2-TUT(config-line)#login
R2-TUT(config-line)#exit

5) Assign IP address for Ethernet interface (Fa0/0):

The Ethernet network 213.123.20.128/27 has:

Increment:32 (/27 = 255.255.255.224 or 1111 1111.1111 1111.1111 1111.1110 0000)
Network address: 213.123.20.128
Broadcast address: 213.123.20.159 (because 128 + 32 – 1 = 159)

Therefore the last assignable host address in this subnet is 213.123.20.158 and we will assign it to Fa0/0 interface with these commands:

R2-TUT(config)# interface fa0/0
R2-TUT(config-if)#ip address 213.123.20.158 255.255.255.224
R2-TUT(config-if)#no shutdown
R2-TUT(config-if)#exit

6) Assign IP address for Serial interface (S0/0):

Serial network 200.0.1.16/28 has:

Increment:16 (/28 = 255.255.255.240 or 1111 1111.1111 1111.1111 1111.1111 0000)
Network address: 200.0.1.16
Broadcast address: 200.0.1.31 (because 16 + 16 – 1 = 31)

So the last assignable host address in this subnet is 200.0.1.30. Finally we assign it to s0/0/0 interface:

R2-TUT(config)# interface s0/0/0
R2-TUT(config-if)#ip address 200.0.1.30 255.255.255.240
R2-TUT(config-if)#no shutdown
R2-TUT(config-if)#exit

7) Configure RIP v2 routing protocol:

R2-TUT(config)#router rip
R2-TUT(config-router)#version 2
R2-TUT(config-router)#network 213.123.20.0
R2-TUT(config-router)#network 200.0.1.0
R2-TUT(config-router)#end
R2-TUT#copy running-config startup-config

Note: We should use classful networks (213.123.20.0 & 200.0.1.0) when configuring RIP. If we use detailed networks (213.123.20.128 & 200.0.1.16) the router will automatically convert them into classful networks.

Show Configuration Sim

This task requires the use of various show commands from the CLI of Router1 to answer 5 multiple-choice questions. This does not require any configuration.

NOTE: The show running-configuration and the show startup-configuration commands have been disabled in this simulation.
To access the multiple-choice questions, click on the numbered boxes on the right of the top panel.
There are 5 multiple-choice questions with this task. Be sure to answer all 5 questions before leaving this item.

Question 1

What is the broadcast address of the subnet of the LAN connected to Router1?
A – 192.168.136.15
B -192.168.136.31
C -192.168.136.63
D – 192.168.136.127
E – 255.255.255.255

Answer: A

Explanation

The “show running-configuration” and “show startup-configuration” have been disabled as stated above so we should use the show ip interface command to get information about the LAN network connected to Router1.

From the output we learn that the ip address of the FastEthernet interface of Router1 is 192.168.136.1 and the subnet mask is /28. Therefore:

Increment: 16 (/28=1111 1111.1111 1111.1111 1111.1111 0000)
Network address: 192.168.136.0
Broadcast address: 192.168.136.15 (15 = 0 + 16 – 1)

-> The broadcast address of this subnetwork is 192.168.136.15

Question 2

What is the bandwidth on the WAN interface of Router1?
A – 16 Kbit/sec
B – 32 Kbit/sec
C – 64 Kbit/sec
D – 128 Kbit/sec
E – 512 Kbit/sec
F – 1544 Kbit/sec

Answer: E

Explanation

To find out the bandwidth on the WAN (serial) interface of Router1 we need to use the show interfaces serial 0/0 command:

Therefore the bandwidth on the WAN is 512 Kbit/sec.

Question 3

What interfaces on Router1 have not had any configurations applied? (Choose two)

A – Ethernet 0
B – FastEthenet 0/0
C – FastEthernet 0/1
D – Serial 0
E – Serial 0/0
F – Serial 0/1

Answer: C F

Explanation

Use the show ip interface brief to identify what interfaces Router 1 have. Notice that Router1 does not have Ethernet 0 and Serial 0 interfaces. FastEthernet 0/0 and Serial 0/0 were configured with their IP addresses therefore only FastEthernet 0/1 and Serial0/1 have not had any configurations applied.

Question 4

Including the address on the Router1 FastEthernet interface, how many hosts can have IP addresses on the LAN to which Router1 is connected?
A – 6
B – 14
C – 62
D – 128

Answer: B

Explanation

The mask address of interface Fa0/0 of Router1 is /28 (as shown in question 1), which has four 0 bits (1111 1111.1111 1111.1111 1111.1111 0000). Therefore there are 2⁴ – 2 = 14 assignable IP addresses for hosts on the LAN.

Question 5

The hosts in the LAN are not able to connect to the Internet. Which commands will correct this issue?
A – Router1(conf)# interface fa0/0
Router1(conf-if)# no shutdown
B – Routed (conf)# interface fa0/1
Router1(conf-if)# no shutdown
C – Router1(conf)# interface s0/0
Router1(conf-if)# no shutdown
D – Router1(conf)# interface s0/1
Router1(conf-if)# no shutdown
E – Router1(conf)# interface s0/0
Router1(conf-if)# ip address 10.11.12.13 255.255.255.252
F – Router1(conf)# interface s0/1
Routerl (conf-if)# ip address 10.11.12.13 255.255.255.252

Answer: C

Explanation

We should check the statuses of all the interfaces on Router1 with the show ip interface brief command:

From the output, we learn that the status of Serial0/0 interface which connects to ISP router is currently “administratively down”. This status indicates this interface is shutting down so we need to turn it on.