H12-891 Online Practice Questions and Answers

In different scenarios, RSTP provides different protection functions, and the wrong statement about this statement is

A. The root protection feature is enabled for the specified port, and its port role can only remain as the specified port

B. When the anti-TC-BPDU packet attack feature is enabled, the number of times the switching device processes IC BPDU packets per unit time is configurable

C. after the BPDU protection function is enabled on the switching device, if the edge port receives RST BPDU, the edge port will be set to a non-remote port and the spanning tree calculation will be re-performed

D. Start the specified port of root protection, when the port receives a better RSTBPDU, the port will enter the Discarding state and is no longer forwarding packets. If the port does not receive a better RSTBPD for a period of time then automatically revert to the normal Forwarding state

MSTP switches treat RSTP switches as MSTP domains, MSTP, which are formed by a single switch The interchange resolves the RSTBPDU to MSTBPDU, where IRPC is 0

A. True

B. False

BGP EVPN does MAC address advertisement, ARP message advertisement, and IRB route advertisement for which BGP EVPN route is advertised?

A. Type3

B. Type2

C. Type4

D. Type1

In order to reduce the number of OSPF routes in some unscheduled areas, the OSPF protocol has developed special area functions, and the following characteristic description of ospf special areas is correct?( Single choice questions).

A. ASBR-Sunmary-LSA is allowed to be published to NSSA regions

B. AS-External-LSA is allowed to be published to Stub regions

C. Any OSPF zone can be configured as a special zone

D. Special area routers cannot establish OSPF neighbor relationships with regular area routers

When troubleshooting a local area network, you notice a large number of frame alignment errors, FCS errors and LAG conflicts, and the possible cause of these problems is ?

A. Switches and terminals are interconnected over 10/100/1000base-T Ethernet links, and switches and terminals operate in half-duplex mode

B. There is a mode mismatch on the 1000base-LX/LH link

C. The operating mode does not match

D. on a 10/1000/1000base-T Ether link This type of error occurs in most environments

Regarding the sliding window of TCP, what are the following descriptions that are enough to be wrong? ( Multiple choice question)

A. The sender declares the initial window size

B. The sender does not need to transmit messages of full window size

C. The TCP sliding window allows multiple packets to be sent before an acknowledgment is received

D. After the retransmission timer times out, the sender has not received an acknowledgment and will retransmit unacknowledged data

E. The receiver needs to acknowledge the sender's packet

F. Sliding window size can only be increased or remain unchanged

/R1Jospf1lRL-osp- jarea.2[RLospf-1-arca-0002]network1001310000 As shown in the configuration, the administrator configured OSPF but RI on R1 You cannot learn routes for other routing rings. Then the possible cause is the question).

A. This router does not have an OSPF process number configured

B. This router is configured with a different zone ID than its neighbor router's zone ID

C. This router does not have authentication features configured, but neighbor routers configure authentication features

D. The declared network address of this router does not match the interface mask

In an intra-domain MPLSVPN network, when a packet enters the public network and is forwarded, it is encapsulated with two layers of MPLS tags, and the description of the two layers of tags in the following options is incorrect

A. The outer label of mpls VPN is assigned by the LDP protocol or statically, and the inner label is assigned by the MP-BGP neighbor of the peer

B. The outer label of MPLS VPN is called a private network label, and the inner label is called a public network label

C. The outer label is used to correctly send packets to the appropriate VPN in

D. on the PE device By default, the outer label is ejected before the packet is forwarded to the last hop device

An engineer performed the ingestion operation on an OSPF router in a network of the company, is the following statement about the introduction of the routing LSA correct?

A. The A. Advertising Router report is set to as the Router ID of ASBR

B. Net Mask is set to all 0

C. Link State lD is set as the destination network segment address

D. Using the Link State ID and Advertising Router, you can uniquely identify an LSA

What are the ways to divide VLANs in Huawei switches? ( Multi-select) A Subnetting based on IP.

A. Division based on QoS

B. Partitioning based on port

C. Division based on protocol

D. Division based on MAC address.

In ospf broadcast networks, there are 4 routers RTA, RTB, RTC, and RTDs within the same network segment The DR priorities are 2, 1, 1, and O, and the Router ID is respective 1921681.1, 19216821, 19216831, and 19216841 If the OSPF protocol is enabled on both of these four routers, ospf selects the BDR as

A. RTB

B. RTC

C. RTD

D. RTA

What are the common ways to learn routing in BGP? ( Multi-select)

A. receives neighbor routing information

B. Introduce static routes

C. BGP routing for other AS is introduced

D. Introduced Direct Route

Which of the following are single-packet attacks?

A. Special control message attacks

B. Scan Probe Attack

C. DDos Attack

D. Malformed Message Attack

The following description of 8021S deployment characteristics is correct?( Multiple choice question)

A. All VLANs share a spanning tree instance

B. Multiple bridges share a spanning tree instance

C. Each VLAN has one spanning tree instance

D. Multiple VLANs share a spanning tree instance

In an HWIP multicast network, where multiple sources exist and each source has several receivers, which protocol allows source-to-RP traffic and RP-to-receiver traffic to share the same tree 2?

A. MOSPF

B. PIM SM

C. DVMRP

D. 56768GZliuji

E. PIM-DM