q&a session mipv6 and pmipv6

Copyright 2000-2021 Intelligent Networking Laboratory

Sungkyunkwan University

Q&A Session

MIPv6 and PMIPv6

Mobile Computing


Prepared by S.M. Raza, T-D. Nguyen and H. Choo

[email protected]

mailto:[email protected]

2021 Fall Mobile Computing Intelligent Networking Laboratory 2/14

MIPv6 and PMIPv6Question 1

IPv4 uses options field and IPv6 uses extensions to implement added

functionalities in network layer. Which statement(s) is/are true about IPv4 option

field and IPv6 extensions.

a) Structure of IPv4 options field and IPv6 extensions is same

b) Routers can skip IPv4 options field

c) Routers can skip IPv6 extensions

d) None of the above

Extension headers

<IPv4 header> <IPv6 header>



IPv6 uses 128 bits long addresses comparing to 32 bits long addresses in IPv4.

Other than huge increase in address space what are the benefits of IPv6?

a) Header format is simplified

b) Computation time is reduced in the routers

c) Security features are enhanced

d) Improved compatibility with IPv4

e) All of the above



A network team decides to implement IP mobility support across several network

domains. Which IP mobility protocol is best suited?(*)

a) Proxy Mobile IPv6 (PMIPv6)

b) Mobile IPv6 (MIPv6)

c) IPv6

d) All the above

e) None of the above

**Assuming device compatibility issues are resolved

SKKU Suwon Campus Layout

Domain 1

Domain 2

Domain 3

Domain 4



For implementing IP mobility with different level of support for residents within its

domain, which protocol is best suited?(*)

a) PMIPv6

b) MIPv6

c) Hierarchical MIPv6

d) All the above

e) None of the above

**Assuming device compatibility issues are resolved



MIPv6 provides local and global IP mobility, so that it is widely implemented in:

a) Wireless LAN

b) Mobile networks

c) Enterprise wireless networks




Triangular routing is a method for transmitting data packets in communication

networks. Which definition of triangle routing in MIPv6 is correct?

a) Routing of packets to and from MN in foreign link

b) Routing of packets from MN ➔ HA ➔ CN, and vice versa

c) Routing of Binding Update messages from MN to HA


MN: Mobile Node

HA: Home Agent

CN: Correspondent Node

BU: Binding Update



How Home Agent in MIPv6 informs all the nodes in the home link once the Mobile

Node is moved to the foreign agent?

a) By sending Binding Update message

b) By sending Proxy Binding Acknowledgement message

c) By sending Proxy Neighbor Advertisement message

d) By sending Home Agent Solicitation message

MN

Home Network

Home Agent

Foreign Network Binding

? ? ?

Movement MN



What is/are correct about MIPv6 and PMIPv6:

a) In MIPv6, MN tells the Home Agent about the MN mobility

b) In PMIPv6, new MAG informs the previous MAG that MN is now connected to new

MAG

c) In PMIPv6, MN tells the new MAG to inform the LMA when the MN is connected to

the new MAG

d) In MIPv6, there is no device playing proxy role

MN: Mobile Node

LMA: Local Mobility Anchor

MAG: Mobile Access Gateway



PMIPv6 domain is like a home link in MIPv6, what is/are correct among these

statements?

a) Between LMA and MAG, we need to create two tunnels (forward and backward)

b) With tunneling, the source and destination addresses are unchanged in the original

packets between MN and CN

c) When LMA receives a packet from CN toward MN, it only modifies the payload field


LMA: Local Mobility Anchor

MAG: Mobile Access Gateway

CN: Correspondent Node

MN: Mobile Node

LMA

Mobile Node

MAG 1 MAG 2

PMIPv6 Domain



Route optimization in PMIPv6 is needed because:

a) Route through LMA has high transmission cost

b) Packet route between LMA and CN has more transmission cost than between

LMA and MN

c) PMIPv6 does not require route optimization




Which figure represents a worst case in PMIPv6 from delay perspective

MAG

LMA

MAG

ｂ) Figure ２

MN CN

LMA

MAG

a) Figure 1

CNMN

MAG

LMA

MN

CN

Internet

ｃ) Figure ３



Home Network Prefix (HNP) is sent to MN through Router Advertisement (RA)

message. Who assigns HNP to MN?

a) MAG

b) AAA

c) LMA

d) CN

AAA: Authentication, Authorization, and Accounting



During the handover in PMIPv6, if the time for PBU from next MAG (MAG 2) to

reach the LMA is greater than LMA waiting time after DeReg PBU from previous

MAG (MAG 1), then this is regarded as:

a) New MN registration

b) MN handover

c) MN handover relapsed

d) MN authentication failure

Figure 1 Figure 2

Copyright 2000-2021 Intelligent Networking Laboratory


Thanks to contributors

Dr. Syed M. Raza

Dr. Tien-Dzung Nguyen

Prof. Hyunseung Choo

q&a session mipv6 and pmipv6

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