H3 (Models)

Question 1

What are the 4 layers in TCP/IP

Answer 1

Application, Transport, Internet, Network Access

Question 2

What are the 7 layers in OSI

Answer 2

Application
Presentation
Session
Transport
Network
DataLink
Physical

Question 3

Name the application layer protocols

Answer 3

DNS, HTTP, DHCP, SMTP, POP3, IMAP, FTP, TFTP

Question 4

Name the transport layer protocols

Answer 4

UDP, TCP

Question 5

Name the Network/internet layer protocols

Answer 5

IP, NAT, ICMP

Question 6

Name the DataLink layer protocols

Answer 6

ARP, PPP, Ethernet, Interface drivers

Question 7

Explain how data goes through the layers

Answer 7

Data > Segment > Packet > Frame > Bits

Application > Transport > Network > Datalink > Physical

Question 8

Explain how a HTML Message is converted

Answer 8

1. Converted into data
2. HTTP Header added by the HTTP Protocol
3. HTTP Protocol delivers to the TCP Protocol
4. TCP Protocol adds IP addressing
5. DataLink layer adds Source and dest MAC and encapsulates
6. Frame is send to router
7. Router re-encapsulates

Question 9

What is muliplexing

Answer 9

Messages are segmented so conversations can be interlaced and there are no SPOF’s

Question 10

What is in the header of the DataLink frame and how big is it

Answer 10

Preamble ( + SFD). 7 + 1 byte
Dest + source MAC. 12 bytes
EtherType. 2 bytes.

Question 11

What is in the trailer of the DataLink frame and how big is it

Answer 11

FCS. 4 bytes.

FrameStop

Question 12

What is the size of a DataLink frame

Answer 12

64-1518 bytes