Please refer to the attached document for the Read up on the assignment.


Part A

Subpart I) Can Computer A directly address Computer B at the data‐link layer? Explain why or why not.

Subpart II) Identify which adapter(s) would receive a data‐link layer broadcast transmitted by

Computer A (if any), and which would not (if any). Provide an explanation of why each adapter present

in the preceding figure would or would not receive the broadcast.

Part B

Imagine that Computer B successfully transmits an IPv4 packet to Computer A, that there are no

errors on any frame or packet, and that the ARP cache on all computers and the router is already fully

populated.

Subpart I) What specific task(s) does the router perform to facilitate this communication?

Subpart II) Identify any data‐link layer frame(s) that are created in this scenario. For each frame,

identify the adapter it originates from and the adapter it is addressed to, explain why it was created,

and provide its source and destination MAC address and source and destination IPv4 address.


Problem 3: Creating Routing Table Rules
Here we will use the same network configuration as in Problem 2. Three networks – Network A,
Network B, and Network C ‐‐ are connected to each other with one router between Network A and
Network B, and another router between Network B and Network C. The MAC and IPv4 addresses of
each network adapter are configured as illustrated in the following figure.
Configuration of Two Nonadjacent Networks
Computer A Router AB
Network Adapter AB1
MAC: 12‐61‐AB‐A5‐12‐9D
IPv4: 75.126.216.1/22
Network Adapter AB2
MAC: 1B‐19‐C3‐C7‐EF‐19
IPv4: 69.172.200.1/23
Network Adapter A
MAC: AD‐51‐CD‐DF‐79‐81
IPv4: 75.126.218.151/22
Network A Network B
Network Adapter BC2
MAC: AB‐99‐13‐F7‐7F‐03
IPv4: 171.223.4.1/24
Network Adapter C
MAC: 19‐29‐30‐BB‐CC‐D3
IPv4: 171.223.4.33/24
Network C
Router BC Computer C
Network Adapter BC1
MAC: 1A‐1A‐CB‐DB‐EC‐1C
IPv4: 69.172.201.1/23
When you are asked to create routing table rules, make sure to specify the Network Destination,
Netmask, Gateway, and Interface fields, and explain why each field’s value has been chosen in your
answer. You do not need to include the Metric field, since metric specifics can only be determined
with knowledge of the specifics of a computer’s environment. You may use the titles given in the
figure for the network adapter specifications in the routing table.
Part A – Computer A’s Routing Table Configuration
Subpart I) Calculate the network address and subnet mask of all three networks. You will need these
values to create rules for the computer’s routing table.
Subpart II) Create a routing table for Computer A that has no default route, and that supports sending
packets to all hosts (directly or indirectly) on Network A, Network B, and Network C. A hint is that this
routing table will contain three rules.
Subpart III) Create a routing table for Computer A that has a default route, and that supports sending
packets to all hosts (directly or indirectly) on Network A, Network B, and Network C.
Subpart IV) In this scenario, would you recommend using the routing table in Subpart II, or the routing
table in Subpart III? Explain why.
Part B – Router BC’s Routing Table Configuration
Create a routing table for Router BC which has no default route, which supports communications to all
hosts (directly or indirectly) on Network A, Network B, and Network C. A hint is that the routing table
will contain three rules.