9 - Internet Transport Layer Protocols

Question 1

Length of IPv6 addr

Answer 1

128 bits

Question 2

Replacement of data for

• Type of Service
• Real-time delivery
• TTL

Answer 2

• Traffic Class
• Flow Label support
• Hop Limit

Question 3

Segments of IPv6 packet

Answer 3

Version -> Traffic Class -> Flow Label -> Payload Length -> Next Header -> Hop Limit -> Src Addr -> Dest addr

Question 4

Global Routing Prefix Unicast implementation?

Answer 4

First 3 bits set to 001

Question 5

Special Addr for IPv6 -

Answer 5

::1 equivalent of 127.0.0.1 (loopback)

Question 6

TCP/IP 3-way connection est

Answer 6

A->B SYN, ISNa
B->A SYN, ISNb, ACK (ISNa)
A->B ACK(ISNb)

Question 7

What does SSN stand for?

Answer 7

Synchronize Sequence Number

Question 8

What does ISN stand for?

Answer 8

Initial Sequence Number

Question 9

TCP/IP USES which protocol?

Answer 9

Sliding window

Question 10

RTT

Answer 10

Round Trip Time

Question 11

SRTT

Answer 11

Smoothed Round Trip Time

= (a x SRTT) + ((1-a) x RTT)

Question 12

What does a mean in SRTT?

Answer 12

Smoothing Factor

Question 13

MDEV

Answer 13

Mean Deviation of RTT

Question 14

SMDEV

Answer 14

Smoothed Mean Deviation

SMDEV = (a x SMDEV) + ((1-a) x MDEV)

Question 15

TCP/IP sliding window method (4)

Answer 15

• Sends single packet
• ACK returned
• Sends 2 packets, doubling the window size
• Keeps doubling until all packets are lost, then resets to 1

Question 16

Relationship between server and client

Answer 16

Not symmetrical

Question 17

What is more important than file operations?

Answer 17

Names

Question 18

The kernel for Berkeley sockets consists of certain layers (3)

Answer 18

• Socket: Provides the interface between user programs and networking
• Protocol: Supports different protocols in use, TCP/IP, X.25
• Device: Supports physical devices such as eth controllers

Question 19

Common properties shared by sockets (2)

Answer 19

• Naming conventions

- Protocol addr formats

Question 20

Sockets are initially created …

Answer 20

… unbound

Question 21

Bind()

Answer 21

Provides an addr (name) for the local end of the socket

Question 22

listen() and accept () are used to…

Answer 22

…prepare for call from clients