H12-221 Questions And Answers
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Exam Name: HCNP-R&S-IERS(Huawei Certified Network Professional-Implementing Enterprise Routing and Switching Network)
Updated: 2019-03-24
Q & A: 330
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Question No : 1
Which of the following are well-known communities attributes? (Select 3 answers)
A. NO_EXPORT (OxFFFFFF0l)
B. N0_ADVERT1SE (0xFFFFFF02)
C. NO_EXPORT_SUBCONFED
D. AS (2Byte): Number (2Byte)
A. NO_EXPORT (OxFFFFFF0l)
B. N0_ADVERT1SE (0xFFFFFF02)
C. NO_EXPORT_SUBCONFED
D. AS (2Byte): Number (2Byte)
Answer: A,B,C
Question No : 2
RTA and RTB are interconnected through a FE interface in an OSPF area. Which of the following can be used to configure the link cost between RTA and RTB as 10? (Select 2 answers)
A.Use command "ospf cost 10" on the two routers
B. Use command "ospf cost 5" on the two routers
C. Use command "bandwidth-reference 500" on the two routers to change bandwidth-reference value
D. Use command "bandwidth-reference 1000" on the two routers to change bandwidth-reference value
A.Use command "ospf cost 10" on the two routers
B. Use command "ospf cost 5" on the two routers
C. Use command "bandwidth-reference 500" on the two routers to change bandwidth-reference value
D. Use command "bandwidth-reference 1000" on the two routers to change bandwidth-reference value
Answer: A, D
Question No : 3
Which of the following is the address range assigned by IANA for SSM service in IPv4?
A.232.0.0.0/24
B. 225.0.0.0/8
C. 232.0.0.0/8
D. 239.0.0.0/8
A.232.0.0.0/24
B. 225.0.0.0/8
C. 232.0.0.0/8
D. 239.0.0.0/8
Answer: D
Question No : 4
RTA is a source's DR and RTB is an RP. A multicast source sends multicast data to RTA but RTB
cannot find any information about the multicast source (registered by using the PIM Register
message). Why? (Select 3 answers)
A. RTB has no unicast routes to RTA,
B. RTA fails to learn RP information.
C. RTA has no unicast routes to RTB.
D. The RPlearned by RTA is not RTB.
cannot find any information about the multicast source (registered by using the PIM Register
message). Why? (Select 3 answers)
A. RTB has no unicast routes to RTA,
B. RTA fails to learn RP information.
C. RTA has no unicast routes to RTB.
D. The RPlearned by RTA is not RTB.
Answer: B,C,D
Question No : 5
Which is the origin attribute of the BGP routes redistributed using the import-route command?
A.IGP
B. EGP
C. Incomplete
D. Unknown
A.IGP
B. EGP
C. Incomplete
D. Unknown
Answer: C
Question No : 6
How many hosts can the network 154.27.0.0 support, if not subnetted?
A.254
B. 1024
C. 65,534
D. 16,777,206
A.254
B. 1024
C. 65,534
D. 16,777,206
Answer: C
Question No : 7
Which of the following statements regarding RPs are true? (Select 3 answers)
A.Different group addresses on a PIM-SM network corresponds to different RPs.
B. An RP is the root of an RFT
C. An RP is elected out of BSRs.
D. All routers on a PIM-SM network must automatically discover the location of RPs.
A.Different group addresses on a PIM-SM network corresponds to different RPs.
B. An RP is the root of an RFT
C. An RP is elected out of BSRs.
D. All routers on a PIM-SM network must automatically discover the location of RPs.
Answer: A, B, D
Question No : 8
To which attribute type does the BGP AS-Path attribute belong?
A.Well -known Mandatory
B. Well-known Discretionary
C. Optional Transitive
D. Optional Non-transitive
A.Well -known Mandatory
B. Well-known Discretionary
C. Optional Transitive
D. Optional Non-transitive
Answer: A
Question No : 9
A router receives a packet whose destination address is 195.26.17.4. Which of these subnets does this address belong to?
A.195.26.0.0/21
B. 195.26.16.0/20
C. 195.26.8.0/22
D. 195.26.20.0/22
A.195.26.0.0/21
B. 195.26.16.0/20
C. 195.26.8.0/22
D. 195.26.20.0/22
Answer: B
Question No : 10
Which of the following route prefixes match the IP-prefix-filter given below?
"ip ip-prefix test index 10 permit 10.0.0.0 16 greater-equal 24 less-equal 28" (Select 3 answers)
A.10.0.1.0/23
B. 10.0.1.0/24
C. 10.0.1.0/25
D. 10.0.1.0/28
"ip ip-prefix test index 10 permit 10.0.0.0 16 greater-equal 24 less-equal 28" (Select 3 answers)
A.10.0.1.0/23
B. 10.0.1.0/24
C. 10.0.1.0/25
D. 10.0.1.0/28
Answer: B, C, D
Question No : 11
How does community attribute of the BGP route set by routing policies affect route selection?
A.The Community attribute directly affects route selection because it must be compared during the route selection process.
B. The Community attribute does not affect route selection because it is non-transitive and cannot be transmitted between routers.
C. Routes are classified by the Community attribute which indirectly affects route selection. Different route attributes such as the Local-Preference and MED values can be set for routes in different communities.
A.The Community attribute directly affects route selection because it must be compared during the route selection process.
B. The Community attribute does not affect route selection because it is non-transitive and cannot be transmitted between routers.
C. Routes are classified by the Community attribute which indirectly affects route selection. Different route attributes such as the Local-Preference and MED values can be set for routes in different communities.
Answer: C
Question No : 12
Which of the following messages needs to be sent out by a downstream interface when recovering
from the pruned state to the forwarding state in PIM DM?
A. Join
B. Assert
C. Prune
D. Graft
from the pruned state to the forwarding state in PIM DM?
A. Join
B. Assert
C. Prune
D. Graft
Answer: D
Question No : 13
Which of the following statements is false?
[RTA]display ospf peer
OSPF Process 1 with Router ID 1.1.1.1
Neighbors
Area 0.0.0.0 interface 10.1.1.1(Ethernet0/0)'s neighbor(s)
RouterlD: 2.2.2.2 Address: 10.1.1.2
State: Full Mode: Nbr is Master Priority: 1
DR: 10.1.1.1 BDR: 10.1.1.2
Dead timer expires in 35s
Neighbor has been up for 04:35:02
A.The OSPF Router ID of the local router is 1.1.1.1.
B. The OSPF Router ID of the neighbor is 2.2.2.2.
C. The OSPF Router ID of the neighbor is larger and thus the neighbor acts as a DR.
D. The local router acts as slave.
[RTA]display ospf peer
OSPF Process 1 with Router ID 1.1.1.1
Neighbors
Area 0.0.0.0 interface 10.1.1.1(Ethernet0/0)'s neighbor(s)
RouterlD: 2.2.2.2 Address: 10.1.1.2
State: Full Mode: Nbr is Master Priority: 1
DR: 10.1.1.1 BDR: 10.1.1.2
Dead timer expires in 35s
Neighbor has been up for 04:35:02
A.The OSPF Router ID of the local router is 1.1.1.1.
B. The OSPF Router ID of the neighbor is 2.2.2.2.
C. The OSPF Router ID of the neighbor is larger and thus the neighbor acts as a DR.
D. The local router acts as slave.
Answer: C
Question No : 14
IGMP interface group report information
Ethernet6/l/l(40.1.1.1):
Total 1 IGMP Group reported
Group: 232.0.0.1
Uptime: 00:00:22
Expires: off
Last reporter: 40.1.1.3
Last-member-query-counter: 0
Last-member-query-timer-expiry: off
Group mode: include
Versionl-host-present-timer-expiry: off
Version2-host-present-timer-expiry: off
Source list:
Source: 20.1.1.56
Uptime: 00:00:22
Expires: 00:05:08
Last-member-query-counter: 3
Last-member-query-timer-expiry: 00:00:01
Source: 20.1.1.57
Uptime: 00:00:22
Expires: 00:00:17
Last-member-query-counter: 3
Last-member-query-timer-expiry: 00:00:01
The preceding information shows the entry status of an IGMP interface on Ethernet 6/1/1 on a router.
Assume IGMP sends the group-and-source-specific Query message. Which of the following statements is true?
A.IGMP sequentially sends two messages; The source carried in one of the messages is 20.1.1.56 with no S flag bit set; the source carried in the other message is 20.1.1.57, with the S flag bit set to1.
B. IGMP sequentially sends two messages: The source carried in one of the messages is 20.1.1.56 with the S flag bit set to 1; the source carried in the other message is 20.1.1.57, with no S flag bit set.
C. IGMP sends only one message carrying two sources 20.1.1.56 and 20.1.1.57, with the 5 flag bit set to1.
D. IGMP sends only one message carrying two sources 20.1.1.56 and 20.1.1.57, with no S flag bit set.
Ethernet6/l/l(40.1.1.1):
Total 1 IGMP Group reported
Group: 232.0.0.1
Uptime: 00:00:22
Expires: off
Last reporter: 40.1.1.3
Last-member-query-counter: 0
Last-member-query-timer-expiry: off
Group mode: include
Versionl-host-present-timer-expiry: off
Version2-host-present-timer-expiry: off
Source list:
Source: 20.1.1.56
Uptime: 00:00:22
Expires: 00:05:08
Last-member-query-counter: 3
Last-member-query-timer-expiry: 00:00:01
Source: 20.1.1.57
Uptime: 00:00:22
Expires: 00:00:17
Last-member-query-counter: 3
Last-member-query-timer-expiry: 00:00:01
The preceding information shows the entry status of an IGMP interface on Ethernet 6/1/1 on a router.
Assume IGMP sends the group-and-source-specific Query message. Which of the following statements is true?
A.IGMP sequentially sends two messages; The source carried in one of the messages is 20.1.1.56 with no S flag bit set; the source carried in the other message is 20.1.1.57, with the S flag bit set to1.
B. IGMP sequentially sends two messages: The source carried in one of the messages is 20.1.1.56 with the S flag bit set to 1; the source carried in the other message is 20.1.1.57, with no S flag bit set.
C. IGMP sends only one message carrying two sources 20.1.1.56 and 20.1.1.57, with the 5 flag bit set to1.
D. IGMP sends only one message carrying two sources 20.1.1.56 and 20.1.1.57, with no S flag bit set.
Answer: B
Question No : 15
Which of the following describes the relationship between BGP and AS?
A.BGP only runs between ASs, and cannot run within an AS.
B. BGP is an EGP used by ASs to exchange routing information with other ASs.
C. BGP builds network topologies by exchanging link-state information between ASs.
D. BGP cannot run between ASs.
A.BGP only runs between ASs, and cannot run within an AS.
B. BGP is an EGP used by ASs to exchange routing information with other ASs.
C. BGP builds network topologies by exchanging link-state information between ASs.
D. BGP cannot run between ASs.
Answer: B
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