H12-891 Online Practice Questions and Answers

The correct description of the scene shown in the following figure is: A. LSDB

B. R1, which exists in both Level-1 and Leve-2, can ping the interface address of R2 loopback0

C. R there is a route to R2 loopback0 10022/32

D. No neighbor relationship can be established between R1 and R2

After you divide an interface of the firewall into the Untrust security domain, the interface belongs to the Untrust zone and no longer belongs to the Local zone.

A. TRUE

B. FALSE

The following description of the PPPoE data frame is correct?( Multiple choice questions).

A. Once a PPPoE session is established, all Ethernet packets are unicast

B. The Ethernet_Type domain is fixed to Ox8863

C. When PPPoE passes session data, Code must be set to Ox0

D. The Session_ID of the PPP session is not allowed to change and must be the specified in the Discovery phase

As shown in the figure, a company sets up an OSPF network. The links in the figure all form OSPF adjacencies, and all OSFP devices declare their own loopback addresses. One day SIR2 The two links of the S2AR1 suddenly failed, and in order to detect if the network was operating properly, the engineers performed a device status check, which is correct as described below

A. R5 can normally learn the loopback route to R2

B. R3 can not learn the loopback route to R2

C. R1 can normally learn the loopback route

D. R3 of R2 The loopback route of R2 can be learned normally

What descriptions of the OSPF protocol are correct?

A. AS-External-LSA describes the router's path to ASBR

B. The cost value of the second type of external route is only the AS external cost value, ignoring the AS internal cost value C. AS-External-LSA does not belong in any region

D. AS-External-LSA describes the path to the as outside of the route, and the scope of the flood is the AS outside

What are the characteristics of Syslog information?

A. The transmission of Syslog messages is not secure

B. The transmission of Sysiog messages is reliable

C. The transmission of Syslog messages is confirmable

D. The transmission of Syslog messages is secure

E. The transmission of Syslog messages is not acknowledgable

F. The transmission of Syslog messages is unreliable

Is the following description of the OSPFv3 message correct?

A. The interface ID of the sending interface must be included in the A Hello packet

B. The LSACK message contains LSA header information to confirm the receipt of LSU packets

C. The LSR message contains the complete LSA header information for requesting an update to the LSA

D. Hello messages and the Option field for DD messages extends to 24-bit

The following about BGP routing, what is the wrong description?

A. Non-aggregate routes take precedence over aggregate routes.

B. In the case of PrefVal, Local_Preference equality, if the BGP preference of the locally generated route, IBGP route, EBGP route is equal, the valid reference of this generation is preceded by priority.

C. See the following entry in the BGP routing table: ?*172 16 1. 11/32 0 00010 0? Indicates that the route is available non-optimal.

D. For next_hop unreachable routes are invalid cat by and do not participate in the preference. Flogging case

About multi-instance CE (Multi-VPN-Instance CE, MCE). What is the error described below?

A. Users who connect to the same MCE but are not part of a VPN instance cannot access each other

B. The MCE vs. PE direction must have multiple physical links to achieve isolation between different VPN instances

C. MCE-enabled devices can access multiple VPI instances in BGP/RPLS IPVPN applications, reducing user network equipment investment

D. On the MCE device, you need to create their own routing tables for different VPNs and bind to the corresponding interface

What is wrong with the following statement about digital certificates?

A. Digital signatures guarantee the integrity of digital certificates.

B. Digital certificates contain public key information.

C. Authentication fails when the peer certificate is received within the validity period, but the device itself is in the wrong time if it is not within the validity period of the certificate.

D. Even if two PRI entities are not in the same CA system, authentication can be completed as long as both parties can recognize each other's CA.