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create-a-router-table-for-router-f-for-each-row-in-the-table-identify-the-destination-ip-address

Mar 23

IT120, Spring, 2016

Homework 4

Page 1 of 3

1. (10pts) Create a router table for Router F. For each row in the table identify the destination IP address
and the IP Address (not the router name) used for the next hop. Assume all network addresses use a /8
mask. Router T should be the default next hop.

11.0.0.4

13.0.0.2
S

R

Network
11.0.0.0

11.0.0.7
12.0.0.1

14.0.0.2

12.0.0.7
T

Network
14.0.0.0

Network
13.0.0.0

Network
12.0.0.0

15.0.0.7

15.0.0.1

13.0.0.3
A

13.0.0.4

F

Network
15.0.0.0

Add or delete rows if necessary in the table
Destination Network

2.

Next Hop

(10pts) Using the figure from question 1, create a router table for Router S. For each row in the table
identify the destination IP address and the IP Address (not the router name) used for the next hop.
Assume all network addresses use a /8 mask. Router F should be the default next hop.
Add or delete rows if necessary in the table
Destination Network

Next Hop

IT120, Spring, 2016

3.

Homework 4

Page 2 of 3

(10pts) Router XYZ has forwarding table:
Network/Mask
Next_Hop
94.212.192.0/20
deliver directly
94.212.208.0/20
10.0.0.1
94.212.224.0/19
20.0.0.2
94.212.192.0/18
30.0.0.3
0.0.0.0/0
40.0.0.4
Explain what router XYZ will do with packets with the following destination addresses. Make sure to
use longest prefix routing.
a. 94.212.193.15
b. 94.212.204.2
c. 94.212.210.10
d. 94.212.185.10
e. 30.0.0.3
f. 94.212.196.12
g. 94.212.191.11
h. 94.212.192.255
i. 94.210.224.20
j. 94.212.226.250

4. (5pts) Connect to afsconnect1.njit.edu. If you don’t know how see the NJIT webpage to download
MobaXterm and review its features (https://ist.njit.edu/accounts/accessafs.php ).
Perform the following. Type “netstat -nr” to display the routing table in this host.
a. Take a snapshot of the window and include it in the homework.

b. What is the IP address of the default router for afsconnect1.njit.edu?
5. (10pts) Routers A and B use the RIPv2 routing protocol
The original routing table (simplified for the purpose of this problem) in A is:
Destination
Net 11
Net 2
Net 3
Net 40
Net 5
Net 61
Net 7

Distance
0
0
6
3
6
5
8

Route
direct
direct
B
L
B
Q
N

IT120, Spring, 2016

Homework 4

Page 3 of 3

Router B sends the following routing table to A:
Destination
Net 11
Net 31
Net 40
Net 5
Net 61
Net 7
Net 3
Net 9

Distance
2
6
1
5
5
15
15
14

Show the contents of the routing table in A after it has been revised to reflect the information from B.
Add or delete rows if necessary in the table
Destination

Distance

Route

Explanation

6. (5pts) Using your answer from problem 5, what would router A send out as an update?
EXTRA CREDIT:
1. (6pts) Provide two reasons why it is important for a network administrator to document the existing network
configuration.

  

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