Networking, Routers and Routing

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BTEC National Diploma
Networking, Routers and Routing

Assignment 3: Routing and Troubleshooting
Deadline:
Week of 23/05/06
Student Name_______________________________ Date handed in:________________

Grading Criteria
It is possible to achieve criteria for the following from this assignment.
BTEC Grading Criteria
Tick

Date
Key Skills

P4. test connectivity and troubleshoot networks using ping and traceroute


PS3 LP3
M3. diagnose and correct introduced problems and/or faults and demonstrate
a systematic approach to troubleshooting and fault logging


PS3 LP3
D3. demonstrate a detailed understanding of TCP/IP including the concepts
of flow control, windowing and connectionless and connection oriented
networks


PS3 LP3
Assignment Feedback (with smart targets)
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Student Feedback
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Internal Verifier Comments:

Signed: _____________________________ Date:
___________________

Assignment Brief

Set by: ADR Verified by: Stuart Blackmore Date: Sep 2006

BTEC National Diploma
Networking, Routers and Routing
Assignment 3 – Overview

This assignment provides you with the opportunity to apply the skills you have
developed to date. An understanding of common routing problems and solutions is
essential since you will need to demonstrate a systematic approach to troubleshooting
and fault logging.


Objectives:
This assignment consists of a 3 sections.
The first section assesses your practical skills in diagnosing and correcting network
problems using a simulator and in a lab.
The second section assesses your diagnostic skills in troubleshooting and correcting
network problems.
The third section assesses your level of understanding of TCP/IP including the concepts
of flow control, windowing, and connectionless and connection-orientated protocols.
ADR 2006 2

BTEC National Diploma
Networking, Routers and Routing

Section 1: (P4) Troubleshooting using Ping and Tracert
For this section you will be expected to test connectivity problems on a
network using the ping and trace or tracert commands.
Task 1 Test Connectivity of a Simulated Network
1.1 Carry out the following:

• Load the network topology and configuration files into the simulator.
• Using ping and trace or tracert, test all routes and so identify connectivity
problems on the network.
• Record all ping and trace or tracert commands you used on the fault-
logging record sheet provided in Appendix A of this document. Provide a
conclusion to your investigation by stating which network links are down,
explaining why you came to that conclusion.



Task 2 Test Connectivity of a Network in the LAB
Part of the network will be set up for real, only this time there will be physical
layer problems. You will be expected to test and identify any physical layer
problems.
2.1 At your appointed time in the lab, carry out the following:

• Using ping and trace or tracert or any other appropriate commands,
(except the sh run command), test connectivity and identify any physical
layer problems on the network.
• Record all commands you used on the fault-logging record sheet,
explaining which commands you used and which physical layer
problem(s) you discovered.


ADR 2006 3

BTEC National Diploma
Networking, Routers and Routing

Section 2: (M3) Diagnose and Correct the Problems
For section 2 you will be expected to identify problems on the network using
a range of diagnostic commands. You will be expected to correct and solve
the problems.
Task 1 Diagnose and Correct the Problems on the Simulated Network
You should have already identified all unreachable routes on the network
from section 1 of this assignment.
1.1 Now carry out the following:

• Load the network topology and configuration files into the simulator.
• Using appropriate commands, (the sh run command does not count),
identify and correct the problems on the network.
• Record all commands you used on the fault-logging record sheet. For
each command you used, explain why you used it and if it helped you
diagnose a problem.

Note 1: to obtain the merit criteria, you will need to demonstrate a
systematic approach to troubleshooting and fault logging. Your logs should
be detailed and your troubleshooting strategy clear.
Note 1: Knowing which commands are useful for diagnosing problems is
useful. The table below indicates which commands would be useful for
troubleshooting specific problems.

?
General connectivity testing
?
Ping
?
Trace
?
Telnet
?
Check serial link is DTE or DCE
?
show controllers serial#
?
Check interface is up and not shutdown
?
Check interface protocol is up
?
Check IP address used on interface
?
show ip int
?
sh ip int brief
?
sh int #
?
Check all routes are in table
?
Check routing protocol used
?
Check routing protocol network statements
?
Check RIP updates are being sent/received
?
Check IGRP updates are being sent/received
?
sh ip route
?
sh ip protocol
?
sh ip protocol
?
debug ip rip
?
debug ip igrp transactions
ADR 2006 4

BTEC National Diploma
Networking, Routers and Routing

Section 3: (D3) Demonstrate a Detailed Understanding of TCP/IP
This section tests yours understanding of TCP/IP operation and covers:-
? TCP and the three-way handshake.
? Reliability through segmentation, sequencing and acknowledgment
? Flow control and windowing
? The connectionless UDP protocol
? Multiple conversations and ports
Task 1 TCP Operation
You may recall that the corporate network described previously contains an
Intranet web server. Imagine that a denial-of-service attack was launched
against the server. Before hoping to deal with the problem, you need to
understand how TCP works.
1.1 Using the example above of a denial-of service attack on the Intranet
web server, explain the following TCP operations. Use diagrams to
illustrate your explanation.
a. The normal three-way handshake between two hosts
b. How a denial-of service attack abuses the three-way handshake
Now suppose you have solved the previous problem and network conditions
are back to normal. You decide to Telnet to the server and run some checks.
1.2 Explain how your workstation and the web server use sequencing and
acknowledgment in their TCP communication.
1.3 You have noticed that access to the web server is slower during the busy
period of the day. Explain how windowing allows the flow of information
to be controlled.
Task 2 UDP operation
While you are administering the server, you decide to listen to streamed music
on the Internet.
2.1 Explain why the connectionless UDP is use for streaming media. Give
other examples of UDP use.
Task 3 Multiple conversations between hosts
3.1 Using the example of listening to streaming media while you connected to
another host via Telnet, explain how ports are used to keep track of
multiple conversations between hosts. Explain why sockets are different
from ports.
ADR 2006 5

BTEC National Diploma
Networking, Routers and Routing

Appendix A – Fault-Logging Record Sheet
Use the log sheet below to document all steps and commands you used to identify
connectivity problems on the network. Note: The
show running-config
command
should be used only as a last resort.
You may need to print out a few copies of this record sheet.

Student Name: ____________________ Network Name: _____________________

Router or
Host Name



Command
used





Explain if the
command
helped you
identify a
problem or
solution




































ADR 2006 6

BTEC National Diploma
Networking, Routers and Routing

What you must hand In

Check you have the following documentation:-

For a P4

? Fault-Logging Record sheets describing ping and tracert commands used to
diagnose connectivity problems on the simulated network.

? Fault-Logging Record sheets describing ping and tracert commands used to
diagnose physical layer problems on a real network in the lab.

? Copy of network diagram you were given to show which network you were
assigned to troubleshoot.
For an M3

? Detailed and clear Fault-Logging Record sheets describing appropriate
commands used to diagnose and correct problems on the simulated network.
For an D3

? Explanation of TCP operations, UDP operations and how multiple conversations
between hosts are managed..

ADR 2006 7