Internet Protocol (IP)

Question 1

Describe the Internet Protocol and its characteristics.

Answer 1

Operates at layer 3 of the OSI model and specifies where data should be delivered by identifying the data’s source and destination IP address. Does not guarantee delivery of data, and no session is established before data transmission. It relies on TCP to ensure that messages are put back together in proper order, and to ensure that the message reaches the correct application.

Question 2

Differentiated Services (DiffServ)

Answer 2

Sets priority level for the data being sent.

Question 3

Time to Live (TTL)

Answer 3

Maximum duration that a packet can remain on the network until it is discarded. Refers to the maximum number of router hops a packet has remaining. TTL varies depending on the packet, but is usually set at 32 or 64.

Question 4

Internet Header Length (IHL)

Answer 4

Indicates length of the IP header in bytes. Minimum 20 bytes, maximum 60 bytes. 4-byte increments.