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Exam Code: GB0­280
Vendor: RES
Exam Name: Constructing Enterpriselevel
Routing Networks
Cert Name: HCNE/
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GB0-280
Exam Name:
Constructing Enterprise-level Routing Networks
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Question: 1.
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
Question: 2.
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
Question: 3.
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.
A. True
B. False
Answer: B
Question: 4.
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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
Question: 5.
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
Question: 6.
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
Question: 7.
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
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Question: 8.
BGP community is a group of destinations with public attributes. For a network or an AS there can be
only one community.
A. True
B. False
Answer: B
Question: 9.
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
Question: 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
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Question: 11.
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.
A. True
B. False
Answer: B
Question: 12.
How many attributes can every RADIUS packet carry?
A. 1
B. 2
C. 3
D. Multiple
Answer: D
Question: 13
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
Question: 14.
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.
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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
Question: 15
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
Question: 16.
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
Question: 17.
Which are the right one/ones about OSPF among the following descriptions?
A. If some changes take place on the network topology, OSPF immediately dispatches an update
packet, and synchronizes these changes to the Autonomous System.
B. Comparing with RIP, it can save bandwidth.
C. It supports the dispatch of protocol packets with multicast addresses.
D. The measure ranges 0 through 255.
E. It supports equivalent value routes to the same destination address.
F. Its algorithm prevents self-loop routes.
G. It supports Variable Length Subnet Mask (VLSM)
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Answer: ABCEFG
Question: 18.
The packets of OSPF are encapsulated in the IP. The protocol number used is
A. 23
B. 89
C. 520
D. 170
Answer: B
Question: 19.
The right description to the OSPF protocol are
A. It is a link state-based protocol running in the AS and developed by IETF.
B. According to the collected link state information, OSPF calculates the shortest path to get the route.
C. It allows the AS network to be partitioned into areas. The route information transmitted between
areas is further abstracted to reduce seizure of bandwidth.
D. It transmits the packet according to the multicast address at the multicast-enabled data link layer,
which greatly reduces the interference to the other network equipment.
Answer: ABCD
Question: 20.
In which ways does OSPF describe the network topology?
A. There is only one router on which the port is connected to the network segment.
B. The port connects to a router through point-to-point network.
C. The port connects to multiple routers through broadcast or NBMA network.
D. The port connects to multiple routers through point-to-multipoint network.
Answer: ABCD
Question: 21.
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The right procedure for the OSPF protocol to calculate the route is
A. Every router produces a LSA according to the topology around it.
B. Calculated on the collected LSAs to span a shortest path tree.
C. Send the LSA to the other routers in the network, and meanwhile collect the LSA produced by other
routers.
D. Produce the Link-State Database.
A. A-B-C-D
B. A-C-B-D
C. A-C-D-B
D. D-A-C-B
Answer: C
Question: 22.
In the network running the OSPF protocol£¨only a single area£©, which are right description to LSA
and LSDB among the following?
A. Every router gets the same LSDB (Link-State Database).
B. Every router does not get the same LSDB (Link-State Database).
C. The routing table for each router is different.
D. Each router gets the same routing table.
Answer: AC
Question: 23.
The Hello message in the OSPF protocol is
A. To discover and maintain peers.
B. To describe the local LSDB.
C. To request LSA that does not exist locally to the opposite end, or the opposite end automatically
updates LSA.
D. To elect DR and BDR
E. To have the LSA at the opposite end updated
F. To be dispatched periodically between two OSPF peers, and to monitor the link state.
Answer: ADF
Question: 24.
In the OSPF protocol, the Database Description (DD) packet is
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A. To discover and maintain peers.
B. To describe the local LSDB.
C. To request LSA that does not exist locally to the opposite end, or the opposite end automatically
updates LSA.
D. To elect DR and BDR
E. To have the LSA at the opposite end updated
F. To make the acknowledgement after receiving LSU
Answer: B
Question: 25.
In the OSPF protocol, the LSR packet is to
A. To discover and maintain peers.
B. To describe the local LSDB.
C. To request LSA that does not exist locally to the opposite end, or the opposite end automatically
updates LSA.
D. To elect DR and BDR
E. To have the LSA at the opposite end updated
F. To make the acknowledgement after receiving LSU
Answer: C
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