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2017 May Cisco Official New Released 400-101 Q&As
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CCIE Routing and Switching Written Exam v5.1
QUESTION 831
How does MSTP provide backward compatibility with RSTP?
|
A. |
It uses the hop count variable as a TTL counter. |
|
B. |
It transmits all spanning-tree information in one BPDU. |
|
C. |
It supports up to 128 MSTI messages. |
|
D. |
It encodes the MSTP-specific region information before the legacy RSTP BPDU. |
Correct Answer: D
QUESTION 832
Which standard feature can be exploited by an attacker to perform network reconnaissance?
|
A. |
IP-directed broadcast |
|
B. |
maintenance operations ptotocol |
|
C. |
ICMP redirects |
|
D. |
source quench |
Correct Answer: C
QUESTION 833
How are the Cisco Express Forwarding table and the FIB related to each other?
|
A. |
The FIB is used to populate the Cisco Express Forwarding table. |
|
B. |
The Cisco Express Forwarding table allows route lookups to be forwarded to the route processor for processing before they are sent to the FIB. |
|
C. |
There can be only one FIB but multiple Cisco Express Forwarding tables on IOS devices. |
|
D. |
Cisco Express Forwarding uses a FIB to make IP destination prefix-based switching decisions. |
Correct Answer: D
QUESTION 834
Which statement about the bgp soft-reconfig-backup command is true?
|
A. |
It requires BGP to store all inbound and outbound updates. |
|
B. |
It overrides soft reconfiguration for devices that support inbound soft reconfiguration. |
|
C. |
When the peer is unable to store updates, the updates are implemented immediately. |
|
D. |
It provides soft reconfiguration capabilities for peers that are unable to support route refresh. |
|
E. |
It provides outbound soft reconfiguration for peers. |
Correct Answer: D
QUESTION 835
What happens when an interface is configured as passive in OSPF?
|
A. |
No OSPF neighbor ship is formed on the interface. |
|
B. |
An OSPF neighbor ship is formed with the DR, but not with the BDR. |
|
C. |
The subnet configured on the interface is not advertised to any other neighbor. |
|
D. |
OSPF hello messages are sent as unicast instead of multicast. |
Correct Answer: A
QUESTION 836
Which protocol will accept incoming updates when the passive-interface command is configured?
|
A. |
OSPF |
|
B. |
IS-IS |
|
C. |
RIP |
|
D. |
EIGRP |
Correct Answer: C
QUESTION 837
What are the three HDLC operating modes? (Choose three.)
|
A. |
normal response |
|
B. |
asynchronous balanced |
|
C. |
synchronous response |
|
D. |
asynchronous response |
|
E. |
normal balanced |
|
F. |
synchronous balanced |
Correct Answer: ABD
QUESTION 838
Which three statements about OSPFv3 address families are true? (Choose three.)
|
A. |
Each address family requires the same instance ID. |
|
B. |
Address families can perform route redistribution into any IPv4 routing protocol. |
|
C. |
An address family can have two device processes on each interface. |
|
D. |
IPv4 address family require an IPv4 address to be configured on the interface. |
|
E. |
Each address family uses a different shortest path tree. |
|
F. |
Different address families can share the same link state database. |
Correct Answer: BDE
QUESTION 839
Which BGP feature prevents a router from installing an iBGP learned route in its routing table until the route is validated within the IGP?
|
A. |
confederation |
|
B. |
aggregation |
|
C. |
advertise-map |
|
D. |
synchronization |
Correct Answer: B
QUESTION 840
Which two statements about TCP are true? (Choose two.)
|
A. |
TCP option must be divisible by 32. |
|
B. |
It has a 16-bit window size. |
|
C. |
Its maximum data offset is fifteen 32-bit words. |
|
D. |
It has a 32-bit window size. |
|
E. |
Its maximum data offset is ten 32-bit words. |
|
F. |
It has a 32-bit checksum field. |
Correct Answer: BC
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