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nd

Hi, cisco community team;

help to respond on below related to NDP
1.SeND defines a set of New Neighbor Discovery options. Select the options in the list below:(choose all)
a.CGA Option
b.RSA Signature Option
c.TLS option
d.MD5 option
e.CPS Option

2. The Neighbour Discovery protocol in IPv6 provides the functionality that in IPv4 is
provided by which of the following protocols and/or messages? (choose all)

a.ARP
b.IRDP
c.REDIRECT
d.ICMP
e.RIPv3

3. Which of the following information can be found in a Router Advertisement message? (choose all)

A.The full address for hosts to use
B.One or more addresses to use as DNS recursive servers
C.The prefix to be used on that subnet
D.The suggested Maximum Transmit Unit of packets for the network
E.The link-layer address of the router

6 Replies 6

siskum
Spotlight
Spotlight

Hello,

1. SeND - Secure Neighbour Discovery Protocol: a. CGA option

It is a security extension for Neighbour Discovery Protocol (NDP) which found out valnurability of link-layer addresses so Cryptographically Genarated Address (CGA) encrypted method uses to secure NDP messages to avoid its valnurability of DOS attact, many spoofing attacs so on. Therefor correct answer is a. CGA Option.

(resourses available in internet too)

2. The NDP in IPv6 provide functionality that in IPv4 is.. : a. ARP and d. ICMP

IPv6 NDP perform similar functionality of IPv4 ARP and ICMP therefore correct answers are a. ARP and d. ICMP

3. Which of the following information found in Router Advertisement Message (RA): e. The link-layer address of the router

NDP, Router Solicitation (RS) message sents to all-IPv6-routers in same local network, local-scope multicast address of FF02::1 ask local link of all connected routers. Then they send their IPv6 link-local address as FE80::123:27FF:FE2A:4023. Therefore the correct answer is e. link-layer address of the router.; 

with referance to Harold Ritter updated correct answers in question 3. (relavent refence links attached)

B. One or more addresses to use as DNS recursive servers
C. The prefix to be used on that subnet
D. The suggested Maximum Transmit Unit of packets for the network
E. The link-layer address of the router

 

 

Sisira

Hi @siskum ,

For question 3, the only answer that is not true is A.

B is true per RFC6106.

C, D and E are true per RFC4861.

Regards,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

siskum
Spotlight
Spotlight

Hi Harold,

Thanks for your response reply. Can you tag here those links if you don't mind for RFC6106 and RFC4861. That is mean to correct answers are B,C,D and E not only E.

With kindest regards,

Sisira (@mallawar123)

Sisira

HI Sisira,

RFC 6106 Recursive DNS Server option:

https://www.rfc-editor.org/rfc/rfc6106#page-6

RFC4861 Options format:

https://www.rfc-editor.org/rfc/rfc4861#page-28

Regards,

 

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

siskum
Spotlight
Spotlight

Hi Harold,

I am so admir the conversation happen with you. It is great information you taged here. I want to more clear that When RS (Router Solicitation) message multicast RA (Router Advertisement) message containg not only link-local address but also all the information such that DN Server, source/target link-layer, Prefix; Rederected header and MTU send to the traget router.

Thanks once again.

With kindest regards,

Sisira(@mallawar)

 

Sisira

You are very welcome Sisira

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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