Test 1

Question 1

What is a client?

Answer 1

A piece of computer hardware or software that accesses a service made available by a server.

Question 2

What is a server?

Answer 2

A computer designed to process requests and deliver data to other (client) computers over a local network or the internet

Question 3

Peer to Peer Architecture

Answer 3

No always-on server, request service from peers, self scalability

Question 4

What is a router?

Answer 4

small electronic devices that join multiple computer networks together via either wired or wireless connections

Question 5

Distributed Applications

Answer 5

Applications or software that runs on multiple computers within a network at the same time and can be stored on servers or with cloud comuting

Question 6

Protocol

Answer 6

Defines format, order of messages sent and received among network entities, and actions taken on message transcript

Question 7

TCP

Answer 7

Reliable transport between sending and receiving, flow and congestion control, doesn’t provide timing , security

Question 8

UDP

Answer 8

Unreliable data transfer, does not provide reliability, security, flow control, connection setup

Question 9

Packet Delay

Answer 9

dProc + dQueue + Dtrans (bits/bps) + dProp (length/prop speed)

Question 10

Throughput

Answer 10

Rate at which bits are transferred between sender/receiver, usually measured in bps

Question 11

Transmission delay

Answer 11

time it takes for packet to be transmitted, bits/bps

Question 12

Propagation delay

Answer 12

distance/speed

Question 13

virus

Answer 13

Self replicating, when executed modifies other programs and inserts its own code

Question 14

worm

Answer 14

Self replicating, doesn’t need human interaction, utilizes networks to send copies of code to other computers

Question 15

Trojan Horse

Answer 15

Any hacking computer program pretending to be something they’re not

Question 16

Packet Sniffer

Answer 16

computer program or hardware that can intercept and log traffic that passes over a network

Question 17

Spyware

Answer 17

type of malware that is installed on a computer without the knowledge of the owner to gather valuable data

Question 18

Botnet

Answer 18

Network made up of remote controlled computers or bots that have all been infected with malware that allows them to be remotely controlled

Question 19

Socket

Answer 19

Endpoint of a two-way communication link

Question 20

Cookies

Answer 20

Small files stored on a user’s computer specific to a particular client and website

Question 21

Proxy Caching

Answer 21

Stores content on the proxy server itself, allowing web services to share resources to more users

Question 22

Domain Name Service (DNS)

Answer 22

Like an internet phone book, maintains a directory of domain names and translates them to IP addresses

Question 23

Bandwidth

Answer 23

maximum data transfer rate of a network or interet connection