H6 (Network Layer)

Question 1

What are the 4 processes

Answer 1

Addressing end devices
Encapsulating segments into packets with IP Info
Routing
De-encapsulation upon arival

Question 2

What does the transport layer do

Answer 2

Exchange data between processes

Question 3

What does the network layer doe

Answer 3

Exchange data between hosts

Question 4

What are the 3 characteristics of IP

Answer 4

Connectionsless: low overhead
Best effort: no error checking, unreliable
Media Independent

Question 5

What does connectionless mean

Answer 5

The sender doesn’t know if a packet arrived or if the receiver is present or can open it.

The receiver doesnt know when the packet is coming

Question 6

What makes IP still reliable

Answer 6

The transport layer

Question 7

What is fragmentation

Answer 7

Splitting up a packet when it is to big for another medium

Question 8

How big is the IPv4 header

Answer 8

20 bytes

Question 9

Version field

Answer 9

0100 or 0110, 4 bits

Question 10

DS Field

Answer 10

8 bits, concists out of 6 bit DSCP and 2 bit ECN. Used to determine importance of packet.

Question 11

TTL

Answer 11

8 bits

Question 12

Protocol

Answer 12

Determines the payload type 8 bit. ICMP (1), TCP(6), UDP(17)

Question 13

Source + dest mac

Answer 13

64 bits

Question 14

What is used to identify and validate a packet

Answer 14

The Internet Header Length and the Header checksum

Question 15

What are IPv4 issues

Answer 15

Address depletion
Routing Table taking up a lot of recources
No end-to-end due to NAT

Question 16

What are IPv6 benefits

Answer 16

Larger address space
No need for NAT
Improved packet handling: smaller overhead

Question 17

Traffic class

Answer 17

same as DS

Question 18

Flow label

Answer 18

same label receives same handling by router

Question 19

Payload length

Answer 19

Indicates length of paylaod

Question 20

Next Header

Answer 20

Same as protocol field

Question 21

An IPv4 header consists out of

Answer 21

Version
Internet Header Length
DS
TTL
Protocol
Header Checksum
Source Dest

Question 22

An IPv6 header consists out of

Answer 22

Version
Traffic class
Flow label
Payload length
Next header
Hop limit
source dest