3.20 - Implement IPv6 neighbor discovery Flashcards

2
Q

What are the five ICMPv6 messages used by the Neighbor Discovery Protocol?

A

Router Advertisement (RA)Router Solicitation (RS)Neighbor Solicitation (NS)Neighbor Advertisement (NA)Redirect

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3
Q

What is the purpose of the M and O flags in the RA?

A

The are used for address autoconfiguration. M for Managed access and O for other stateful

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4
Q

What is the purpose of the Reachable Time field of the RA?

A

Specifies the time in that a node should assume a neighbor is reachable after the neighbor confirms it reachability (in ms)

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5
Q

What is the purpose of the Retransmit Timer field in the RA?

A

specifies the minimum time between retransmitted Neighbor Solicitation messages (in ms)

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6
Q

What is indicated if the Router Lifetime field in the RA is set to 0?

A

Indicates that the originating router should not be added to the host’s default router list.

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7
Q

What is the purpose and effect of the S flag in the NA?

A

Solicited flag, is set when the NA is in response to an NS.

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8
Q

What is the difference between stateful and stateless address autoconfiguration?

A

Stateful address autoconfiguration relies on DHCPv6 for address allocation. Stateless address autoconfiguration usues RA’s to determine a prefix of a larger scope to determine host’s address

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9
Q

When a device acquires a unicast IPv6 address it must perform Duplicate Address Detection, with one exception. What is that exception?

A

Never performed on an anycast address

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10
Q

What does the prefix FF02:0:0:0:0:1:FF00::/104 signify?

A

Solicited node multicast adddresses. Prepended to the last 24 bits of an address being solicited.

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11
Q

What does IPv6 use in place of ARP and an ARP cache?

A

NDP Neighbor Address function

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12
Q

What does an Incomplete state of an entry in the neighbor cache signify?

A

Neighbor Address resolution is in progress

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13
Q

What does a Probe state of an entry in the neighbor cache signify?

A

An NS has been sent to verify two-way reachability of a stale entry but the NA has not been received.

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14
Q

What two ways does Neighbor Unreachability Detection use to verify two-way reachability of a neighbor?

A

Either by “hints” from an upper level protocol or by actively probing the neighbor with an NS.

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15
Q

What is the purpose and effect of the R flag in the NA?

A

Indicates the originator is a router in an NA packet

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16
Q

What is the purpose and effect of the O flag in the NA?

A

Indicates that the information contained in the NA should override any existing neighbor cache entry and update the cached link-layer address.

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17
Q

What is the command to enable the sending of RAs on ethernet and FDDI interfaces?

A

ipv6 unicast-routing

18
Q

What is the command to change the IPv6 RA interval?

A

ipv6 nd ra-interval

19
Q

What is the command to change the RA Router Lifetime on a cisco router?

A

ipv6 nd ra-lifetime

20
Q

What is the default RA interval on a Cisco router?

A

200 seconds

21
Q

What is the default value of RA Router Lifetime on a cisco router?

A

1800 seconds

22
Q

What is the default reachable time on Cisco router?

A

0 (unspecified)

23
Q

How do you set the reachable time of an RA?

A

ipv6 nd reachable-time

24
Q

How do you set the retransmit timer of an RA?

A

ipv6 nd ns-interval

25
Q

What is the default of the RA retransmit timer on a Cisco?

A

0 ms

26
Q

What is the command to set the M flag for RA on a Cisco router?

A

ipv6 nd managed-config-flag

27
Q

What is the command to set the O flag for RA in a Cisco router?

A

ipv6 nd other-config-flag