Intro Adnan Flashcards
In many ways, the cargo is segmented and loaded into a fleet of trucks, packets are analogous to
___, communication links are analogous to ___, packet switches are
analogous to ___, and end systems are analogous to ___. Link-layer switches are
typically used in ___, while routers are typically used in the ___.
trucks, highways and roads, intersections, buildings, access networks, network core
TCP supports connection-oriented services. True or False?
True
UDP supports connection-oriented services. True or False?
False
Which apps use TCP? Provide examples
HTTP, FTP, Telnet
Which apps use UDP? Provide examples
Streaming media, DNS, Teleconferencing
Role of bit in physical media
propagates between
transmitter/rcvr pairs
Physical link
what lies
between transmitter &
receiver
Packet transmission delay formula
length of packet / transmission rate
Describe ring topology? Pros and cons
Every computer serves as a repeater to boost signals. Very expensive to add computers, more expensive
Bus Topology? Pros and cons?
Simple, low cost, single cable called trunk, only one computer can send message at a time
Star Topology
Every computer connected to a single host, more cabling, more expensive
Which topology does not exist? Mesh, Bus, Ring, Star, Hybrid, Total
Total
How long does it take to send a file of 640,000
bits from host A to host B over a circuit-switched
network?
▪ All links are 1.536 Mbps
▪ Each link uses TDM with 24 slots/sec
▪ 500 msec to establish end-to-end circuit
1,536,000/24 = 64000
640,000/64,000=10 seconds
10 + .5 = 1-.5seconds
one-hop numerical example: ▪ L = 7.5 Mbits ▪ R = 1.5 Mbps ▪ one-hop transmission delay? end-to-end delay?
one-hop transmission = 5
end-to-end delay = 10
PAN is
Personal Area Network
LAN
Local Area Network
CAN
Campus Area Network
WAN
Wide Area Network
MAN
Metropolitan Area Network
You are at distance of 10 000 meters. which area network will u cover?
MAN
Why should one use and not use Peer-Peer architecture?
Give two examples for yes, and two for no
Less expensive hardware, easy to setup, low cost, easy to administer - yes
Not secure, no central point, additional load - no
Describe Peer-Peer Architecture
Each computer is available for making its resources available to the other computers in network
Which is bigger MAN or WAN?
WAN
Name for sources of packet delay
Processing, Queuing, Transmission, Propagation
