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2021 Apr 400-101 free practice questions
Q81. Which two statements about LDP advertising when Explicit Null is in effect are true? (Choose two.)
A. Penultimate hop popping is disabled.
B. Penultimate hop popping is enabled.
C. It is the default behavior for LDP.
D. It is used for the advertisement of static routes.
E. It is used for the advertisement of connected routes.
Answer: A,E
Q82. Which technology can be affected when switches are used that do not support jumbo frames?
A. 802.1x
B. BFD
C. OSPFv3
D. 802.1q
Answer: D
Explanation:
The 802.1Q tag is 4 bytes. Therefore, the resulting Ethernet frame can be as large as 1522 bytes. If jumbo frames are not supported, then typically the MTU on an Ethernet link needs to be lowered to 1496 to support this extra 802.1Q tag.
Q83. Refer to the exhibit.
Which option is the result of this configuration?
A. Devices in OSPF area 15 can reach the summary route 192.168.0.0/16 and its more specific subnets.
B. Devices in OSPF area 15 can reach only the more specific routes of 192.168.0.0/16.
C. Devices in OSPF area 0 can reach the summary route 192.168.0.0/16 and its more specific subnets.
D. Devices in OSPF area 0 can reach only the summary route of 192.168.0.0/16.
Answer: A
Explanation:
. area range
To consolidate and summarize routes at an area boundary, use the area range command in router configuration mode. To disable this function, use theno form of this command. Area area-id range ip-address mask [advertise | not-advertise] [cost cost] no area area-id range ip-address mask [advertise | not-advertise] [cost cost]
. Syntax Description
area-id
Identifier of the area about which routes are to be summarized. It can be specified as either a decimal value or as an IP address.
ip-address
IP address.
mask
IP address mask.
advertise
(Optional) Sets the address range status to advertise and generates a Type 3 summary link-state advertisement (LSA).
not-advertise
(Optional) Sets the address range status to DoNotAdvertise. The Type 3 summary LSA is suppressed, and the component networks remain hidden from other networks.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/iproute/command/reference/fiprrp_r/1rfospf. html
Q84. When you migrate a network from PVST+ to rapid-PVST+, which two features become inactive? (Choose two.)
A. Root guard
B. Loop guard
C. UplinkFast
D. UDLD
E. BackboneFast
F. Bridge Assurance
Answer: C,E
Explanation:
It is good to know the UplinkFast and BackboneFast behavior before you start the migration process.
Here, the Access1 switch runs Cisco IOS. This output is taken before migration to the rapid-PVST+ mode:
Access1#show spanning-tree vlan 10
VLAN0010
Spanning tree enabled protocol ieee
Root ID Priority 24586
Address 0015.63f6.b700
Cost 3019
Port 107 (FastEthernet3/0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 49162 (priority 49152 sys-id-ext 10)
Address 000f.f794.3d00
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Uplinkfast enabled
Interface Role Sts Cost Prio.Nbr Type
Fa3/0/1 Root FWD 3019 128.107 P2p
Fa3/0/2 Altn BLK 3019 128.108 P2p
Access1#show spanning-tree summary
Switch is in pvst mode
Root bridge for: none
Extended system ID is enabled
Portfast Default is disabled
PortFast BPDU Guard Default is enabled
Portfast BPDU Filter Default is disabled
Loopguard Default is disabled
EtherChannel misconfig guard is enabled
UplinkFast is enabled
BackboneFast is enabled
Configured Pathcost method used is short
Name Blocking Listening Learning Forwarding STP Active
VLAN0010 1 0 0 1 2
VLAN0020 1 0 0 1 2
2 vlans 2 0 0 2 4
This output is taken after the mode is changed to rapid-PVST+:
Access1#show spanning-tree vlan 10
VLAN0010
Spanning tree enabled protocol rstp
Root ID Priority 24586
Address 0015.63f6.b700
Cost 3019
Port 107 (FastEthernet3/0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 49162 (priority 49152 sys-id-ext 10)
Address 000f.f794.3d00
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
UplinkFast enabled but inactive in rapid-pvst mode
Interface Role Sts Cost Prio.Nbr Type
Fa3/0/1 Root FWD 3019 128.107 P2p
Fa3/0/2 Altn BLK 3019 128.108 P2p
Access1#show spanning-tree summary
Switch is in rapid-pvst mode
Root bridge for: none
Extended system ID is enabled
Portfast Default is disabled
PortFast BPDU Guard Default is enabled
Portfast BPDU Filter Default is disabled
Loopguard Default is disabled
EtherChannel misconfig guard is enabled
UplinkFast is enabled but inactive in rapid-pvst mode
BackboneFast is enabled but inactive in rapid-pvst mode
Configured Pathcost method used is short
Name Blocking Listening Learning Forwarding STP Active
VLAN0010 1 0 0 1 2
VLAN0020 1 0 0 1 2
2 vlans 2 0 0 2 4
You can see in the show spanning-tree summary command output that UplinkFast and BackboneFast are enabled, but are inactive in rapid-PVST mode.
Reference: http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/72836-rapidpvst-mig-config.html#upback1
Q85. Refer to the exhibit.
You are configuring the S1 switch for the switch port that connects to the client computer. Which configuration blocks users on the port from using more than 6 Mbps of traffic and marks the traffic for a class of service of 1?
A)
B)
C)
D)
A. Exhibit A
B. Exhibit B
C. Exhibit C
D. Exhibit D
Answer: A
Explanation:
Only option A specified that the exceed and violate actions are set to drop for traffic over the CIR of 6 Mbps, and is also configured to set all traffic with a COS of 1 using the “set cos1” command.
Updated 400-101 actual exam:
Q86. Which two statements about a network running MPLS VPN with IS-IS IGP are true? (Choose two.)
A. IS-IS traffic engineering uses wide metric TLV type 135 with an up/down bit to define a leaked route.
B. IS-IS traffic engineering uses wide metric TLV type 128 with an internal/external bit and an up/down bit to define a leaked route.
C. IS-IS traffic engineering uses wide metric TLV type 130 with an internal/external bit and an up/down bit to define a leaked route.
D. If the IS-IS up/down bit is set to 1, the leaked route originated in the L1 area.
E. The MPLS VPN IS-IS core is inherently protected against IP-based attacks.
Answer: A,E
Q87. Which cache aggregation scheme is supported by NetFlow ToS-based router aggregation?
A. prefix-port
B. AS
C. protocol port
D. destination prefix
Answer: A
Q88. DRAG DROP
Drag and drop the multicast protocol or feature on the left to the correct address space on the right.
Answer:
Q89. Which two statements about IP SLAs are true? (Choose two.)
A. They are Layer 2 transport independent.
B. Statistics are collected and stored in the RIB.
C. Data for the delay performance metric can be collected both one-way and round-trip.
D. Data can be collected with a physical probe.
E. They are used primarily in the distribution layer.
Answer: A,E
Q90. Which three statements about IS-IS are true? (Choose three.)
A. IS-IS is not encapsulated in IP.
B. IS-IS is directly encapsulated in the data link layer.
C. 0XFEFE is used in the Layer 2 header to identify the Layer 3 protocol.
D. IS-IS uses protocol ID 93.
E. IS-IS can be used to route the IPX protocol.
F. IS-IS is an IETF standard.
Answer: A,B,C
Explanation:
IS-IS is an Interior Gateway Protocol (IGP) for routing OSI. IS-IS packets are not encapsulated in CLNS or IP but are encapsulated directly in the data-link layer. The IS-IS protocol family is OSI, and values such as 0xFE and 0xFEFE are used by the data-link protocol to identify the Layer 3 protocol as OSI.
Reference: http://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a3e6f.sh tml