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Free H12-261_V3.0 Exam Braindumps (page: 8)

Page 7 of 120
PDF with 479 Questions

If a router only needs to forward IPv6 packets, then there is no need to configure any IPv4 protocol and address on the router.

  1. True .
  2. false

Answer(s): A



Is the following procedure for NDP resolving link layer addresses correct?

  1. True
  2. false

Answer(s): B

Explanation:

Section: (none) Explanation

Neighbor Discovery Protocol (English:Neighbor Discovery Protocol for short: NDP or ND) is a part of the TCP/IP protocol stack and is mainly used together with IPv6.
The principle of NDP address resolution:
In the process of NDP address resolution, two types of ICMP packets are used: Type135: NS Neighbor Solicitation
Type136: NA neighbor advertisement message
In simple terms, the end that initiates active communication (A in this environmentR1) Before sending ICMP data, first send NS message, NS messageThe function of the message is to request the MAC address of the target communication address.
When the peer AR2 receives the address resolution, it will actively reply to the NA message. The NA message carries AR2's own MAC address to complete the resolution.
NS message parsing:
The source address is the interface address of AR1, and the destination address is the requesting node multicast group of the AR2 address. Type: 135
Target Address: 2012::2, the destination address of the required request. Source link-layer addres:
Source link layer address, MAC address.
So thisThe meaning of the NS message is that the source 2012::1 needs to resolve the MAC address of the destination address 2012::2. My own MAC address is 00:E0:FC:FB:66:05. Please reply to me when you receive it.
NA packet parsing:

The source address is the interface address of AR2, and the destination address is the interface address of AR1. At this time, AR2 has learned the IP address and MAC address of the source AR1 through NS packets, so it can be sent by unicast.
Type: NA message, 136
Target Address: The requested address.
Target link-layer address: The MAC address of the requested address. So thisThe NA message means that 2012::1 needs to request the link layer address of the target address 2012::2 is 00:E0:FC:7D:5F:96. This completes bidirectional address resolution.



BGP4+ is running between the two routers, and the neighbor relationship is normal, but the BGP routing table of the local router does not have any neighbor routing entries. The following possible reasons are:

  1. The routing entry in the peer BGP routing table is not optimal.
  2. The next hop address of the BGP route entry is unreachable?
  3. The peer is configured with peer ignore
  4. The peer is configured with active-route-advertise

Answer(s): A,B,D

Explanation:

peer ignore the command will stop the session with the specified peer (group) and clear all relevant routing information. Neighbor relations are not normal. The active-route-advertise command configures BGP to advertise only the routes that are preferred in the IP routing table.



What neighbors?

  1. iBGP-Multi-hop not configured
  2. Authentication failed
  3. IGP routing failure
  4. Inconsistent BGP protocol versions

Answer(s): B,C,D

Explanation:

IBGP does not need to configure multi-hop, and can use loopback to establish neighbors. EBGP is not directly connected to the interface to establish a neighbor, it needs to refer to multiple hops.






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