EC441:IntroductiontoComputerNetworking Fall2009
Lab3 Solutions
U
Question 1 Stop-and-Wait simulation. For Ploss =0.2 and a=2 plot and print the simulated time diagram. Explain the diagram in detail for the 16 first time units. Mark the moments of time w
EC 441 Lab 1 Solutions 1. Calculate analytically the expected data rate (bandwidth) for the CBR source parameters used in 1.2.4. Expected data rate = 500 Bytes / 0.005 s = 100 kB/s = 800 kb/s 2. From the data generated by the simulation in 1.2.4, plot the
Problem 6 Coding delay is (48*8) / (64*103) = 6 ms, transmission delay is 48*8/106 = 0.384 ms, propagation delay is 2 ms. Total delay = 6 ms + 0.384 ms + 2 ms = 8.384 ms
Problem 7 a) 10 users can be supported because each user requires one tenth of the ba
B oston U niversity ECE D epartment
Fall 2 008
Introduction t o C omputerN etworking( BC 4 41)
Exam L ( 11/13/2008)
Instructions
o . o . . T he e xam c onsistso f f our q uestions The duration of the exam is t hour and45 minutes T he m aximum g radei s 1
EC441 Introduction to Computer Networks Fall 2009 Solution to Lab 4 (Prelab)
Problem 8 a) Prefix Match 11100000 11100001 00000000 11100001 otherwise b) Link Interface 0 1 2 3
Prefix match for first address is 4th entry: link interface 3 Prefix match for s
EC 441: Introduction to Computer Networking Fall 2008
Lab 2 Solutions
2.0 Prelab
Question 1 True or False: For credit, please provide a brief justification to every answer. a) Suppose a user requests a Web page that consists of some text and two images. F
Boston University
EC441 Introduction to Computer Networking
Solutions to Homework 4
Problem 6 a) If we divide 10010001000 by 1001 we get 10000001, with a remainder of R = 001. b) If we divide 10100011000 by 1001 we get 10110101, with a remainder of R = 10
Problem 24 a. In the second segment from Host A to B, the sequence number is 289, source port number is 503 and destination port number is 80. b. If the first segment arrives before the second, in the acknowledgement of the first arriving segment, the ack
EC441: Introduction to Computer Networks
Fall 2009 Homework 2 Solutions
Problem 4 Sol: (a) Adding the two bytes gives 10011101. Taking the ones complement gives 01100010 (b) Adding the two bytes gives 00011110. Plus a carrier wrapped around, the ones comp
Boston University ECE Department
Fall 2009
Introduction to Computer Networking (EC 441)
Homework #4
Solve the following exercises from the textbook (Kurose & Ross): Chapter 5: P. 6, P.8, P.9 Additional Question 1 (From Exam)
A
B
C
Consider a multi-hop wir
Boston University ECE Department
Fall 2009
Introduction to Computer Networking (EC 441)
Homework #3
Solve the following exercises from the textbook (Kurose & Ross):
Chapter 3: P. 24, P. 25, P. 26 (read first Focus on Security in pages 267 - 268), P. 27.
Boston University ECE Department
Fall 2009
Introduction to Computer Networking (EC 441)
Homework #2
Solve the following exercises from the textbook (Kurose & Ross):
Chapter 3: P. 4 (in part a. and b., you should compute the 1s complement checksum of the t
Boston University ECE Department
Fall 2009
Introduction to Computer Networking (EC 441)
Homework #1
Solve exercises P.6, P.7, P. 12, P. 18, P. 24 from Chapter 1 in the textbook (Kurose/Ross, 4th edition) Additional Question (from exam):
A
S
B
Consider the