According to this picture, we can judge?
<Huawei>display ospf Isdb router self-originate OSPF Process 1 with Router ID 10.0.12J Area: 0.0.0.0 Type:Router Lsid: 10.0.12 J Adv rtr: 10.0.12.1 Ls age: 312 Len: 36 Options : A, BR E
\seq#:80000013
1 chksum : 0xc61c
I Link count: 1
1 * Link ID: 10.0.12.2
I Data : 10.0.12.1
, Link Type: TransNet
. Metric : 1

• A.R1ofsystem IDYesee8c.a0c2.bafl
• B.R1existinglevel", andlevel-1-2Dimensional state information of
• C.R1onlylevel-2link state information

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R1 executes the operation ping -a lO.l.Ll 10.5.16.2, what is the meaning of this command?

• A.pingpackage sourceIPaddress isR1any direct interface address of
• B.pingpackage sourceIFPaddress isR1direction10.5.16.2the optimalIPThe outgoing interface address of the route, and is not
  10.1.1.1
• C.pingPurpose of the packageIPaddress is10.1.1.1and10.5.16.2
• D.pingpackage sourceIPaddress is10.1.1.1

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The Discovery message of LDP is used for neighbor discovery, and LDP has different discovery mechanisms when discovering neighbors. The following statement about the Discovery message in the basic discovery mechanism is correct

• A.TCPAfter the connection is establisheD. LSRdo not continue sendingHello Message
• B.Purpose of the messageIPaddress is multicastIPaddress224.0.0.2
• C.This message is encapsulated inUDPIn the message, the destination port number is646
• D.The message is sent to the specifiedLDP Peer

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As shown in the figure, an engineer uses 4 routers to test branch network interoperability. Among them, R1, R2, and R3 in branch 1 deploy OSPF to implement network interoperability. R2, R3, and R4 in branch 2 deploy IS-S to implement network interoperability. Now the engineer wants to implement R1 to access the loopback interface address of R4. Which of the following operations can meet this requirement?

• A.existR2ofOSFFprocess neutralizationIS-ISDuring the process, the default route is advertised separately
• B.only atR2ofIS-ISDuring the process, the default route is advertised
• C.only atR2ofOSPFDuring the process, the default route is advertised
• D.No configuration required

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Which of the following statements about VLAN aggregation is true?

• A.OneSuper-VLANcan contain one or moreSub-VLAN
• B.Super-VLANOnly physical interfaces cannot establish Layer 3VLANIFinterface
• C.Sub-VLANContains physical interfaces. Three layers can be builtVLANIFinterface
• D.Sub-VLANfor isolating broadcast domains

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