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Exam : Huawei GB0-280
Title : Huawei(r) Constructing Enterprise-level Routing Networks
1. RTA notifies RTB about a learned route 1.1.1.0/24 from the EBGP peer. RTA and RTB are in the same AS. The attributes of the route are listed as the following:
local preference:100
MED: 100
AS_PATH: 200
Origine: EGP
Next_hop: 88.8.8.1/16
The attributes of the received route by RTB will be ( )
A.Local preference: null, MED: 100,
AS_PATH: 200 100 ,Origine :EGP, next_hop: 10.110.20.1/16
B.Local preference:100, MED: 100,
AS_PATH: 200 ,Origine: EGP, next_hop: 88.8.8.1/16
C.Local preference:100, MED: null,
AS_PATH: EGP, Origine :EGP, next_hop: 10.110.10.1/16
D.Local preference: null, MED: 0,
AS_PATH: 100 200, Origine: EGP, next_hop: 88.8.8.1/16
Answer: B
2. BGP community is a group of destinations with public attributes. For a network or an AS there can be only one community. ( )
T.True
F.False
Answer: F
3. The route will be matched with each if-match clause under the node of the route-policy in order. Passing one if-match clause means passing the whole route-policy. ( )
T.True
F.False
Answer: F
4. To view the information of the DR and BDR in the OSPF area, you can use ( )
A.Display ospf
B.Display ospf error
C.Display ospf interface
D.Display ospf peer
Answer: A
5. Which of the following are right about ESP? ( )
A.ESP encapsulates the data to an IP packet after encryption to ensure its privacy.
B.The user can choose the encrypted Hash algorithm to ensure integrity and authenticity of the packet.
C.In conjunction with anti-replay window and packet authentication, the AH protocol adopts 32 bits sequence number to prevent and defend replay attacks.
D.Under transmission mode, the AH protocol encrypts the effective data in the IP packet.
E.Under the tunnel mode, the AH protocol encrypts the entire IP packet.
Answer: ABCDE
6. In what ways that the Integrated Service varies from Best-Effort services? ( )
A.First Come, First Served.
B.Guaranteed Service
C.Controlled-Load Service
D.Service similar to ISDN
Answer: BC
7. In which ways can VPN benefit the ISP (Internet Service Provider) and VPN user? ( )
A.ISP can build a long-term cooperation with enterprises and extend the service, taking advantage of the existent network resource.
B.It is cost-saving for VPN users.
C.The VPN user can transfer the WAN maintenance task to the profession ISP.
D.The enterprise can allocate network address to the VPN user in a unified way.
E.The private data transmitted through the pubic network is guaranteed with security.
Answer: ABCDE
8. 110.20.1/16
B.Local preference:100, MED: 100,
AS_PATH: 200 ,Origine: EGP, next_hop: 88.8.8.1/16
C.Local preference:100, MED: null,
AS_PATH: EGP, Origine :EGP, next_hop: 10.110.10.1/16
D.Local preference: null, MED: 0,
AS_PATH: 100 200, Origine: EGP, next_hop: 88.8.8.1/16
Answer: B
10.Bi-directional Import refers to that routes are imported mutually between routing protocols. To prevent route loop, you can ( )
A.prohibit route redistributing from 2 different routing processes which runs over the same router into each other.
B.Use filter-policy import
C.Use filter-policy export
D.Use fire-wall
Answer: ABC
9. How many attributes can every RADIUS packet carry? ( )
A.1
B.2
C.3
D.Multiple
Answer: D
10. Why average length of the queue is adopted to check the length of the queue in WRED? ( )
A.Because the queue length can not be calculated directly.
B.Average Queue can balance the resource seizure.
C.Comparing the queue length (the absolute length of the queue) with the thresholds before dropping the packet will lead to unfairness to the burst traffic, which is disadvantageous to traffic transportation.
D.The average length of the queue is related with the types of the supported services.
Answer: C
11. Which of the following is the way to avoid loop in the BGP protocol? ( )
A.Record the source of the route in the attribute: origin
B.Record the AS route in the attribute: AS-Path
C.Record the next hop in the Next-Hop attribute
D.Affect the choice of egress for another AS in the MED attribute
Answer: B
12. Which of the following are the right description to the adjacency between routers in the OSPF protocol? ( )
A.Two routers, if they are in bidirectional adjacency, that is, they receive the Hello message from each other, they automatically become adjacent.
B.If two routers are adjacent, the underlying network between them is probably Point-to-Point.
C.If two routers are adjacent, the underlying network between them is probably Point-to-MultiPoint.
D.If two routers are adjacent, the underlying network between them is probably Broadcast. One of them must be a DR or BDR.
E.Only when the two routers are adjacent will they exchange the LSA message.
Answer: BCDE
13. Two routers running the OSPF protocol are synchronizing the Link State Database. When you check the peer state machine on one of them, it indicates it has reached the FULL state. Therefore, such a conclusion can be drawn that if you check the peer state machine from the other router, it should also indicate that it has reached the FULL state. ( )
T.True
F.False
Answer: F
14. which of the following are the right description to the backbone area? ( )
A.The backbone area ID is 0.0.0.0.
B.All other areas must connect to the backbone area.
C.Between the backbone areas it can be disconnected.
D.Each ABR (Area Border Router) should be connected to at least one backbone area.
Answer: ABD
15. Which is wrong about the BGP protocol? ( )
A.BGP is a robust routing protocol.
B.BGP is to check the route loop.
C.BGP can not summary routes of the same type.
D.BGP inherits from EGP
Answer: C
16. In the BGP protocol, the function of the community attribute NO-EXPORT is to ( )
A.Indicate that the route with this attribute should not be notified to any peer out of the alliance
B.Indicate that the route with this attribute, once received, should not be notified to any BGP peer.
C.Indicate that the route with this attribute, once received, should not be notified to any EBGP peer.
D.None of the above
Answer: A
