IP Protocols

Question 1

TCP

Answer 1

Transmission Control Protocol. Conducts a three way handshake between a client and a server, and then establishes a connection. (Example is SYN, SYN-ACK, ACK) This is connection-oriented.

Question 2

UDP

Answer 2

User Datagram Protocol. Detects if packets are corrupted when the are received by a client using a checksum. It is connection-less.

Question 3

ICMP

Answer 3

Used to communicate information about network connectivity

Question 4

GRE

Answer 4

Generic Routing Encapsulation. Used as a simple and effective way to create a tunnel (GRE Tunnel) over a public network. There is no encryption on this tunnel.

Question 5

IPSec

Answer 5

Used to protect one or more data flows between peers like with GRE(Because GRE offers no security). Data confidentiality, Data integrity, origin authentication and anti-replay.

Question 6

IPSec: AH

Answer 6

Authentication Header. Does not provide encryption but checks the packet for authenticity and integrity. One way hash for packet authentication.

Question 7

IPSec: ESP

Answer 7

Encapsulating Security Payload. Provides confidentiality, data origin authentication, connection less integrity, and anti-replay service.