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2021 Mar 400-101 practice test
Q431. Which two statements about the passive-interface command are true? (Choose two.)
A. A RIP router listens to multicast updates from its neighbor but stops sending multicast updates on the passive interface.
B. In OSPF, configuring passive-interface at the interface level suppresses hello packets for the interface and all sub interfaces.
C. An EIGRP router can form neighbor relationship on the passive interface, but incoming and outgoing multicast updates are disabled on the interface.
D. A RIP router disables all incoming and outgoing multicast updates in the passive interface.
E. In EIGRP, the passive interface stops sending hello packets.
F. In OSPF, the passive interface can receive incoming routing updates and update the device routing table.
Answer: A,E
Q432. Which two options are actions that EEM can perform after detecting an event? (Choose two.)
A. Place a port in err-disabled.
B. Generate an SNMP trap.
C. Reload the Cisco IOS Software.
D. Send an SMS.
Answer: B,C
Explanation:
action snmp-trap
To specify the action of generating a Simple Network Management Protocol (SNMP) trap when an Embedded Event Manager (EEM) applet is triggered, use the action snmp-trap command in applet configuration mode.
ction reload
To specify the action of reloading the Cisco IOS software when an Embedded Event Manager (EEM) applet is triggered, use the action reload command in applet configuration mode.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2s/feature/guide/fs_eem2.html
Q433. What is the ip dhcp snooping information option command used for?
A. It displays information about the DHCP snooping table.
B. It sends a syslog and an SNMP trap for a DHCP snooping violation.
C. It enables the DHCP snooping host tracking feature.
D. It enables DHCP option 82 data insertion.
Answer: D
Explanation:
To enable DHCP option-82 data insertion, perform this task:
Command
Purpose
Step 1
Router(config)# ip dhcp snooping information option
Enables DHCP option-82 data insertion.
Step 2
Router(config)# ip dhcp snooping information option replace
Or:
Router(config-if)# ip dhcp snooping information option replace
(Optional) Replaces the DHCP relay information option received in snooped packets with the switch's option-82 data.
Step 3
Router(config)# do show ip dhcp snooping | include 82
Verifies
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/snoodhcp.html
Q434. Refer to the exhibit.
Which three statements about the device with this configuration are true? (Choose three.)
A. Multiple AFIs are configured on the device.
B. The authentication on 172.16.129.7 is configured incorrectly.
C. The device is configured to support MPLS VPNs.
D. This device is configured with a single AFI.
E. The authentication on 172.16.129.4 is configured incorrectly.
F. The device is configured to support L2VPNs.
Answer: A,B,C
Q435. Which statement describes the purpose of the Payload Type field in the RTP header?
A. It identifies the signaling protocol.
B. It identifies the codec.
C. It identifies the port numbers for RTP.
D. It identifies the port numbers for RTCP.
Answer: B
Explanation:
PT, Payload Type. 7 bits: Identifies the format of the RTP payload and determines its interpretation by the application. A profile specifies a default static mapping of payload type codes to payload formats. Additional payload type codes may be defined dynamically through non-RTP means. An RTP sender emits a single RTP payload type at any given time; this field is not intended for multiplexing separate media streams. A full list of codecs and their payload type values can be found at the link below:
Reference: http://www.networksorcery.com/enp/protocol/rtp.htm
Updated 400-101 exam answers:
Q436. Refer to the exhibit.
If a connection failure occurs between R1 and R2, which two actions can you take to allow CR-1 to reach the subnet 192.168.192.0/24 on R2? (Choose two.)
A. Create a static route on R1 for subnet 192.168.192.0/24 towards R3 and redistribute it into OSPF.
B. Turn up a BGP session between CR-1 and R1.
C. Create a static route on R1 for subnet 192.168.192.0/24 towards R3 and redistribute it into BGP.
D. Turn up an EIGRP session between R1 and R3 with AS 65535.
E. Create an OSPF virtual link between CR-1 and R2 to bypass R1.
Answer: A,B
Q437. Which three protocols support SSM? (Choose three.)
A. IGMPv2
B. IGMPv3
C. IGMP v3lite
D. URD
E. CGMP
F. IGMPv1
Answer: B,C,D
Q438. Refer to the exhibit.
Which IP packets will be accepted from EBGP neighbor 10.1.1.1?
A. IP packets with a TTL count in the header that is equal to or greater than 253
B. IP packets with a TTL count in the header that is equal to 253
C. IP packets with a TTL count in the header that is equal to or greater than 2
D. IP packets with a TTL count in the header that is equal to 2
Answer: A
Explanation:
neighbor ip-address ttl-security hops hop-count
ExamplE.
Router(config-router)# neighbor 10.1.1.1 ttl-security hops 2
Configures the maximum number of hops that separate two peers.
. The hop-count argument is set to number of hops that separate the local and remote peer.
If the expected TTL value in the IP packet header is 254, then the number 1 should be configured for the hop-count argument. The range of values is a number from 1 to 254.
. When this feature is enabled, BGP will accept incoming IP packets with a TTL value that is
equal to or greater than the expected TTL value. Packets that are not accepted are silently discarded.
. The example configuration sets the expected incoming TTL value to at least 253, which is 255 minus the TTL value of 2, and this is the minimum TTL value expected from the BGP peer. The local router will accept the peering session from the 10.1.1.1 neighbor only if it is 1 or 2 hops away.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2s/feature/guide/fs_btsh.html
Q439. Refer to the exhibit.
The two standalone chassis are unable to convert into a VSS. What can you do to correct the problem?
A. Set a different port channel number on each chassis.
B. Set a different virtual domain ID on each chassis.
C. Set the redundancy mode to rpr on both chassis.
D. Add two ports to the port channel group.
Answer: A
Q440. Which statement describes the native VLAN concept in an ISL trunk?
A. It is the VLAN ID that is assigned to untagged packets.
B. It is the VLAN with highest priority.
C. It is the default VLAN for a trunk.
D. There is no native VLAN concept in an ISL trunk.
Answer: D
Explanation:
ISL has no native VLAN concept because it places the entire Ethernet frame in the payload of an ISL frame. Native VLANs is an 802.1Q specific concept