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2021 Apr 400-101 exam topics
Q311. Refer to the exhibit.
You discover that only 1.5 Mb/s of web traffic can pass during times of congestion on the given network.
Which two options are possible reasons for this limitation? (Choose two.)
A. The web traffic class has too little bandwidth reservation.
B. Video traffic is using too much bandwidth.
C. The service-policy is on the wrong interface.
D. The service-policy is going in the wrong direction.
E. The NAT policy is adding too much overhead.
Answer: A,B
Explanation:
In this example, the web traffic will fall into the default class, which is only 15 percent of the 10Mbps Internet connection (1.5Mbps). Meanwhile, video traffic is allowed 50% of the 10 Mbps.
Q312. Which two statements about BGP loop prevention are true? (Choose two.)
A. Advertisements from PE routers with per-neighbor SOO configured include a Site of Origin value that is equal to the configured value of the BGP peering.
B. If the configured Site of Origin value of a BGP peering is equal to the Site of Origin value on a route it receives, route advertisement is blocked to prevent a route loop.
C. AS-override aids BGP loop prevention, but alternate loop prevention mechanisms are also necessary.
D. Advertisements from the neighbors a BGP peering include a Site of Origin value that is separate from the configured value of the BGP peering.
E. If the configured Site of Origin value of a BGP peering is greater than the Site of Origin value on a route it receives, route advertisement is blocked to prevent a route loop.
F. If the configured Site of Origin value of a BGP peering is equal to the Site of Origin value on a route it receives, route advertisement is permitted.
Answer: A,B
Q313. Which is the way to enable the control word in an L2 VPN dynamic pseudowire connection on router R1?
A. R1(config)# pseudowire-class cw-enable
R1(config-pw-class)# encapsulation mpls
R1(config-pw-class)# set control-word
B. R1(config)# pseudowire-class cw-enable
R1(config-pw-class)# encapsulation mpls
R1(config-pw-class)# enable control-word
C. R1(config)# pseudowire-class cw-enable
R1(config-pw-class)# encapsulation mpls
R1(config-pw-class)# default control-word
D. R1(config)# pseudowire-class cw-enable
R1(config-pw-class)# encapsulation mpls
R1(config-pw-class)# control-word
Answer: D
Explanation:
The following example shows how to enable the control word in an AToM dynamic pseudowire connection:
Device(config)# pseudowire-class cw-enable
Device(config-pw-class)# encapsulation mpls
Device(config-pw-class)# control-word
Device(config-pw-class)# exit
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mpls/command/mp-cr-book/mp-a1.html
Q314. Refer to the exhibit.
While reviewing a log file on a router with this NTP configuration, you note that the log entries of the router display a different time than the NTP time.
Which action can you take to correct the problem?
A. Add the localtime keyword to the service timestamps log datetime statement.
B. Add the msec keyword to the service timestamps log datetime statement.
C. Add the statement ntp broadcast to the NTP configuration of the neighboring router.
D. Configure the router to be the NTP master.
E. Remove the datetime keyword from the service timestamps log datetime statement.
Answer: A
Q315. Refer to the exhibit.
Which two statements about this egress queue are true? (Choose two.)
A. The queue 3 buffer is allocated 20 percent, its drop threshold is 100 percent, and it is guaranteed 400 percent of memory.
B. The queue 1 buffer is allocated 30 percent, its drop threshold is 25 percent, and it is guaranteed 100 percent of memory.
C. The queue 1 buffer is allocated 30 percent, its drop threshold is 100 percent, and it is guaranteed 150 percent of memory.
D. The queue 2 buffer is allocated 30 percent, its drop threshold is 200 percent, and it can use at maximum 400 percent of memory.
E. The queue 3 buffer is allocated 30 percent, its drop threshold is 100 percent, and it can use at maximum 400 percent of memory.
Answer: B,D
Leading 400-101 exam topics:
Q316. Which two statements best describes the difference between active mode monitoring and passive mode monitoring? (Choose two.)
A. Active mode monitoring is the act of Cisco PfR gathering information on user packets assembled into flows by NetFlow.
B. Active mode monitoring uses IP SLA probes for obtaining performance characteristics of the current exit WAN link.
C. Passive mode monitoring uses IP SLA to generate probes for the purpose of obtaining information regarding the characteristics of the WAN links.
D. Passive mode monitoring uses NetFlow for obtaining performance characteristics of the exit WAN links.
Answer: B,D
Q317. Which option is the default maximum age of the MAC address table?
A. 300 seconds
B. 500 seconds
C. 1200 seconds
D. 3600 seconds
Answer: A
Explanation:
To configure the maximum aging time for entries in the Layer 2 table, use the mac-address-table aging-time command in global configuration mode.
Syntax Description
seconds
MAC address table entry maximum age. Valid values are 0, and from 5 to 1000000 seconds. Aging time is counted from the last time that the switch detected the MAC address. The default value is 300 seconds.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/lanswitch/command/reference/lsw_book/lsw_m1. html
Q318. Refer to the exhibit.
Which two statements about the R1 configuration are true? (Choose two.)
A. The IP TTL value is copied to the MPLS field during label imposition.
B. The structure of the MLPS network is hidden in a traceroute.
C. The LDP session interval and hold times are configured for directly connected neighbors.
D. R1 protects the session for 86400 seconds.
E. All locally assigned labels are discarded.
Answer: B,D
Q319. Refer to the exhibit.
Which additional configuration is necessary for R1 and R2 to become OSPF neighbors?
A. R1
!
router ospf 1
no passive-interface Fastethernet0/0
!
B. R2
!
router ospf 10
no network 10.1.1.6 0.0.0.0 area 0
network 10.1.1.6 0.0.0.0 area 1
!
C. R1
!
interface FastEthernet0/0
ip ospf mtu-ignore
!
R2
!
interface FastEthernet0/1
ip ospf mtu-ignore !
D. R1
!
no router ospf 1
router ospf 10
network 10.1.1.5 0.0.0.0 area 0
Answer: A
Explanation:
Because the passive interface default command is used, by default all interfaces are passive and no neighbors will form on these interfaces. We need to disable passive interface on the link to R2 by using the “no passive-interface Fastethernet0/0” on R1 under OSPF.
Q320. Refer to the exhibit.
The customer wants to use IP SLA to create a failover to ISP2 when both Ethernet connections to ISP1 are down. The customer also requires that both connections to ISP1 are utilized during normal operations.
Which IP route configuration accomplishes these requirements for the customer?
A. ip route 0.0.0.0 0.0.0.0 192.168.0.1 track 1
ip route 0.0.0.0 0.0.0.0 192.168.1.1 track 2
ip route 0.0.0.0 0.0.0.0 192.168.2.1 track 3
B. ip route 0.0.0.0 0.0.0.0 192.168.0.1 track 1
ip route 0.0.0.0 0.0.0.0 192.168.1.1 track 2
ip route 0.0.0.0 0.0.0.0 192.168.2.1 track 4.100
C. ip route 0.0.0.0 0.0.0.0 192.168.0.1 track 1
ip route 0.0.0.0 0.0.0.0 192.168.1.1 track 2
ip route 0.0.0.0 0.0.0.0 192.168.2.1 track 3.100
D. ip route 0.0.0.0 0.0.0.0 192.168.0.1 track 1 1
ip route 0.0.0.0 0.0.0.0 192.168.1.1 track 2 2
ip route 0.0.0.0 0.0.0.0 192.168.2.1 track 3 3
Answer: C