Application Layer l

Question 1

What is a protocol?

Answer 1

A set of rules or procedures for transmitting data between devices

Question 2

5 layer protocols

Answer 2

Application
Transport
Network
Link
Physical

Question 3

Application layer

Answer 3

Supporting network applications (HTTP, FTP)

Question 4

Transport layer

Answer 4

Process data transfer (TCP, UDP)

Question 5

Network layer

Answer 5

Routing of datagrams from source to destination (IP, routing protocols)

Question 6

Link layer

Answer 6

Data transfer between neighbouring network elements (Ethernet, WiFi)

Question 7

Physical layer

Answer 7

Any physical component on the wire (copper/optical cable)

Question 8

Presentation layer

Answer 8

Allows applications to interpret meaning of data (encryption, compression)

Question 9

Session layer

Answer 9

Provides the mechanism for opening, closing and managing a session

Question 10

TCP & UDP

Answer 10

no encryption, cleartext passwords sent into socket traverse Internet in cleartext

Question 11

TLS/SSL

Answer 11

provides encrypted TCP connection, data integrity, end-point authentication

Question 12

TCP service

Answer 12

reliable transport, flow/congestion control, does not provide timing or security, connection oriented

Question 13

UDP service

Answer 13

unreliable data transfer, does not provide