CS2610 Networks

Question 1

What is TCP?

Answer 1

Transmission Control Protocol - Connection oriented, flow and congestion control. Uses sequence (SYN) and acknowledgement (ACK) #s. Used by internet traffic.

Question 2

What is UDP?

Question 3

How are SYN and ACK numbers chosen?

Answer 3

Client: sends package with SYN number
Server: returns data/acknowledges received package. Client SYN + 1 = ACK, and server has its own SYN.
Client: same, Server SYN + 1 = ACK, same SYN as before.

Question 4

What is NAT?

Answer 4

Network Address Translation - Substituting one IP address/port for another. Also allows multiple to use one public IP. Improves security.

Question 5

Explain the Client-Server Model.

Answer 5

Servers offer services, and clients connect to services.

Question 6

What is HTTP?

Answer 6

Protocol used by browser to request pages, and by server to respond.

Question 6

DNS

Answer 6

Domain Name Service - A distributed database that provides mapping from domain name to IP address. Hierarchical, allows us to type website name and then get access to website.