Huawei H12-261-ENU 問題集

質問 1：
Which of the following description is correct about the process of sending and receiving data frames in the Access mode of the switch interface?
A. Only receive unlabeled data frames in Access mode
B. When receiving a tagged data frame directly discards in Access mode
C. In the Access mode, the VLAN tag of the data frame will be stripped off when sending.
D. When the data frame enters the switch interface, the switch learns the destination MAC address in the data frame.
正解：C

質問 2：
Which of the following statement about IPSec VPN is true? (Multiple choice)
A. two routers establish IPSec VPN through aggressive mode, then a minimum of interaction 4 packets between the two devices build tunnel
B. Two routers establish an IPSec VPN through the master mode. Starting from the fifth packet (inclusive), the payload data is often encrypted.
C. Savage mode can support NAT traversal, while main mode does not support NAT traversal
D. Between two routers, an OSPF neighbor relationship can be established through an IPSec VPN tunnel, and intranet routes can be exchanged.
正解：A,B

質問 3：
Which of the following advanced features does BGP EVPN support?
A. VRRP over VXLAN
B. Multi-live gateway
C. VXLAN Qos
D. ARP broadcast suppression
正解：B,D

質問 4：
In the intranet MPLS BGP VPNF network, when a packet enters the public network for forwarding, it will be encapsulated with two layers of MPLS labels. The following description of the two-layer label, which is wrong?
A. The egress PE uses the inner label when determining which egress CE the message should be sent to.
B. MPLS BGP VPN uses two layers of labels: public network labels (also known as outer labels) and private network labels (also known as inner labels).
C. By default, the router assigns the same label value to all VPNv4 routes destined for the peer PE.
D. The private network label is carried and distributed when the route is delivered by MP-BGP. The public network label is distributed by the LDP protocol.
正解：C

質問 5：
In addition to stateless address autoconfiguration, IPv6 devices can also obtain information such as addresses, gateways, and DNS through DHCPv6.
A. False
B. True
正解：A

質問 6：
Which of the following description is true about the OSPF virtual link?
A. The virtual link can be used to solve the problem that area 0 is divided.
B. A virtual connection can be established in any area, and it belongs to the area itself after it is established.
C. The virtual link uses the outbound interface P as the link address.
D. The cost of the virtual link is 0, it is the optimal link.
正解：A

質問 7：
Router R1 and Router R2 run BGP. Both routers are in the AS 65234. The route of router R2 exists in the BGP routing table of router R1, but is not in the IP routing table of router R1. So, what caused the problem?
A. Router R1 does not enable BGP Multi-hop
B. Routing is not optimal
C. Synchronization is turned off
D. The BGP neighbor relationship is Down.
正解：B

質問 8：
Which of the following is the correct description of the process of registering the source DR with the RP in the PIM-SM?
A. The registration message encapsulates the multicast service data.
B. The RP sends a registration stop message as soon as it receives the registration message.
C. The registration message is a multicast message.
D. The registration message is used to construct an RPT tree between the source DR and the RP.
正解：A

質問 9：
As shown in the figure, an OSPF network is set up by the company. The links in the figure form OSPF adjacencies. All OSPF devices announce their own loopback addresses. One day S1-R2 and S2-R1 two links suddenly failed. In order to check whether the network is running normally, the engineer performed a device status check. Which of the following descriptions are correct? (Multiple Choice)

A. R1 can learn the loopback route of R2 normally.
B. R3 cannot learn the loopback route of R2.
C. R5 can learn the loopback route of R2 normally.
D. R3 can learn the loopback route of R2 normally.
正解：B,C