Problems:
•1) (10 pts) Problem 11 (page 82)
What are two reasons for using layered protocols?
•2) (20 pts) Obtain a copy of latest "Assigned Numbers" RFC
Which RFC defines the "File Transfer Protocol (FTP)"?
What is the status of this protocol?
Find out when and where the next IETF meeting will take place? Who are the area director
and chair of MANET working group?
•3) (30 pts) Use traceroute to:
Acquire a path to website www.ece.utk.edu, identify where the delay bottleneck is?
Acquire another path to website www.cnn.com, what can you tell about the difference and
similarity in terms of delay and path they followed?
By analyzing the path, can you guess the name of routers belong to local ISP, regional ISP,
and national ISP?
Do the same experiment at different time of the day (morning, noon, evening) and plot a
chart to show how delay changes during different time of the day.
•4) (40 pts) Get to know network who's who. Write a no more than half-page essay (each person)
on the major achievements of the following researcher:
Vinton G. Cerf
Robert M. Metcalfe
Tim Berners-Lee
Andrew S. Tanenbaum
Mung Chiang
Reasons for using layered
protocols
Simplification:
To reduce the design complexity of
networks
Reasons for using layered
protocols
To ease the maintenance and
updating
The standardization of different layers
enabled different realizations for a same
layer. Thus enabled different companies to
provide different products for a same layer
Reasons for using layered
protocols
Speed?
Speeding is not a task which layering
can finish.
Problem 2
Which RFC defines the "File Transfer
Protocol (FTP)"?
What is the status of this protocol?
Ans:
0959 File Transfer Protocol. J. Postel, J.
Reynolds. October 1985. (Format:
TXT=147316 bytes) (Obsoletes RFC0765)
(Updated by RFC2228, RFC2640,
RFC2773, RFC3659) (Also STD0009)
(Status: STANDARD)
• Find out when and where the next IETF meeting will
take place? Who are the area director and chair of
MANET working group?
70th IETF - Vancouver, BC, Canada
The Seventieth IETF meeting will be held 2-7
December 2007.
For MANET the chair would be Joseph Macker
and Ian Chakeres. The directors are Ross
callon and David Word.
Trace route
A result of tracert
C:\Documents and Settings\Administrator>tracert www.wangyefu.com
Tracing route to www.wangyefu.com [219.153.12.226]
over a maximum of 30 hops:
1 9 ms 1 ms 1 ms gw-roam1.ns.utk.edu [160.36.248.1]
2 2 ms 4 ms 1 ms bsm01v200.ns.utk.edu [160.36.1.104]
3 7 ms 7 ms 7 ms atl-edge-19.inet.qwest.net [216.207.16.33]
4 7 ms 7 ms 8 ms atl-core-02.inet.qwest.net [205.171.21.121]
5 68 ms 70 ms 68 ms snj-core-02.inet.qwest.net [67.14.32.10]
6 68 ms 68 ms 68 ms sjp-brdr-01.inet.qwest.net [205.171.233.30]
7 67 ms 67 ms 67 ms 205.171.1.6
8 420 ms 410 ms 406 ms 202.97.51.233
9 550 ms 563 ms 477 ms 202.97.33.137
10 508 ms 504 ms 501 ms 222.176.2.237
11 425 ms 427 ms 427 ms 222.176.7.10
12 543 ms 479 ms 539 ms 134.21.153.219.broad.cq.cq.dynamic.163data.com.cn [219.153.21.134]
13 * * * Request timed out.
14 464 ms 457 ms 452 ms 226.12.153.219.broad.cq.cq.dynamic.163data.com.cn [219.153.12.226]
Trace complete.
Network who's who
Vinton G. Cerf
Robert M. Metcalfe
Tim Berners-Lee
Andrew S. Tanenbaum
Mung Chiang