Computer Networks midterm Exam Questions and Answers

Computer Networks midterm Exam
Questions and Answers
What is the internet? - Answer-- Millions of connected computing devices
- communication links
- packet switches

Protocols - Answer-control sending and receiving messages

How do protocols work? - Answer-- TCP connection request
-TCP connection reply
- instruction
- output

2 Types of packet switching - Answer-- DSL (digital service lines)
- Cable

2 Types of circuit switching - Answer-- Frequency-division multiplexing (FDM)
- Time-division multiplexing (TDM)

FDM - Answer-Consistently gets fraction of bandwidth

TDM - Answer-Gets all bandwidth periodically during brief intervals

Circuit vs. Packet switching - Answer-- reservation vs no reservation
- circuit --- preallocates regardless of demand
- packet --- allocates depending on demand

Dnodal - Answer-Dproc+ Dqueue+ Dtrans+ Dprop

Transmission delay - Answer-time it takes to output
= L/R

Propagation delay - Answer-tome it takes when actually processing
= d/s

Queuing delay - Answer-La/R
L = pkt length
R = link bandwidth
a = average pkt rate

Throughput - Answer-the rate at which the sending process can deliver bits to the
receiving process