- Consider the following network topology:
Questions:
- Give the IP forwarding table of
the router 1 (5 pts)
- Give the IP routing table of
the router 1 (5 pts)
- Give the IP forwarding table of
the router 2 (5 pts)
- Give the IP routing table of
the router 2 (5 pts)
- Give the IP forwarding table of
the router 1 (5 pts)
- Suppose the node
98.45.23.15
sends an IP packet to
the node 98.45.25.13
- Which node is the
next node that will
receive the message
from 98.45.23.15 ?
(5 pts)
- When the node in the
previous question
receives the IP packet,
what
ICMP message will
it send to 98.45.23.15 ?
(5 pts)
(Give the content of this ICMP message)
- Which node is the
next node that will
receive the message
from 98.45.23.15 ?
(5 pts)
- For this question, you may need to
login to certain
computers in the MathCS lab using the command:
ssh -X machineName
- Find out the following
information of some of
the computers in the
MathCS department:
- The Ethernet address
of the computer
lab1a.mathcs.emory.edu
Show the command(s) that you used (5 pts)
- The IP address
of the computer
lab1a.mathcs.emory.edu
Show the command(s) that you used (5 pts)
- The IP forwarding table
of the computer
lab1a.mathcs.emory.edu
Show the command(s) that you used (5 pts)
- The IP routing table
of the computer
lab1a.mathcs.emory.edu
Show the command(s) that you used (5 pts)
- The Ethernet address
of the computer
170.140.150.1
Show the command(s) that you used (10 pts)
- You cannot login to
this computer.
Try to figure out a way to get its Ethernet address....
- You cannot login to
this computer.
- The Ethernet address
of the computer
lab1a.mathcs.emory.edu
- Consider the following 2 IP networks:
Information:
- The left IP network has network ID 33.33.33.0/8
- The right IP network has
network ID 44.44.44.0/8
- The host A
on the left IP network
has the IP address 33.33.33.7
- It's IP forwarding and routing tables are given in the figure above
- The host B
on the right IP network
has 2 IP addresses
- The IP address 44.44.44.7
is its "normal" IP address for its
home network
- The IP address 192.168.2.5
is created for some other network operation --- what
purpose is irrelevant to the question
(You should not be completely shocked that a host can have 2 IP addresses because as you know, a router can have multiple IP addresses
- The IP address 44.44.44.7
is its "normal" IP address for its
home network
In this question, an IP packet is represented as follows:
Initially, the ARP cache of node A is empty.
If you need to use encapsulation in your answer, simply put the entire IP packet in the data portion of a new IP packet.
Questions:
- The host A sends an
IP packet with
data = Hello to
the host B using the
IP address
44.44.44.7.
- Show the IP packet
(in the specified representation
given above) that
host A will send. (10 pts)
- What is the ARP request that the host A will broadcast in order to send the IP packet ? (10 pts)
- Show the IP packet
(in the specified representation
given above) that
host A will send. (10 pts)
Answer the questions again, but now:
- The host A sends an
IP packet with
data = Hello to
the host B using the
IP address
192.168.2.5.
- Show the IP packet
(in the specified representation
given above) that
host A will send. (10 pts)
- What is the IP address of the next node will receive (and route) this IP packet ? (10 pts)
- Show the IP packet
(in the specified representation
given above) that
host A will send. (10 pts)