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2017 Mar 400-101 simulations

Q171. Which statement about the EIGRP RTO is true? 

A. It is six times the SRTT. 

B. It is the time that it normally takes for an update to be received by a peer. 

C. It is the time that it normally takes to receive a reply to a query. 

D. It is the average time that it takes for a reliable packet to be acknowledged. 

Answer:

Explanation: 

The RTO is typically six times the SRTT, the value may vary from a minimum of 200 microseconds (ms) to a maximum of 5 seconds (s). 

Reference: EIGRP for IP: Basic Operation and Configuration, Alvaro Retana, Russ White, Don Slice - 2000 


Q172. DRAG DROP 

Drag and drop the router preference on the left to the correct routing sequence (from most preferred to least preferred) on the right. 

Answer: 


Q173. 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 


Q174. Refer to the exhibit. 

All switches have default bridge priorities, and originate BPDUs with MAC addresses as indicated. The numbers shown are STP link metrics. 

After STP converges, you discover that traffic from switch SWG toward switch SWD takes a less optimal path. What can you do to optimize the STP tree in this switched network? 

A. Change the priority of switch SWA to a lower value than the default value. 

B. Change the priority of switch SWB to a higher value than the default value. 

C. Change the priority of switch SWG to a higher value than the default value. 

D. Change the priority of switch SWD to a lower value than the default value. 

Answer:

Explanation: 

In this topology, we see that all port paths and priorities are the same, so the lowest MAC address will be used to determine the best STP path. From SWG, SWE will be chosen as the next switch in the path because it has a lower MAC address than SWF. From SWE, traffic will go to SWC because it has a lower MAC address, and then to SWD, instead of going from SWE directly to SWD. If we lower the priority of SWD (lower means better with STP) then traffic will be sent directly to SWD. 


Q175. Which two protocols are used to establish IPv6 connectivity over an MPLS network? (Choose two.) 

A. 6PE 

B. 6VPE 

C. RSVP 

D. ISATAP 

E. LDP 

F. IPv6IP 

Answer: A,B 


Improved 400-101 actual exam:

Q176. What are two reasons to define static peers in EIGRP? (Choose two.) 

A. Security requirements do not allow dynamic learning of neighbors. 

B. The link between peers requires multicast packets. 

C. Back-level peers require static definition for successful connection. 

D. The link between peers requires unicast packets. 

Answer: A,D 

Explanation: 

There are two ways we can create EIGRP neighbor relationship: 

+ Use “network ” command. This is the more popular way to create EIGRP neighbor relationship. That router will check which interfaces whose IP addresses belong to the and turn EIGRP on that interface. EIGRP messages are sent via multicast packets. 

+ Use “neighbor” commanD. The interface(s) that have this command applied no longer send or receive EIGRP multicast packets. EIGRP messages are sent via unicast. The router only accepts EIGRP packets from peers that are explicitly configured with a neighbor statement. Consequently, any messages coming from routers without a corresponding neighbor statement are discarded. This helps prevent the insertion of unauthorized routing peers -> A and D are correct. 


Q177. 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. 

Answer: B,C 


Q178. Which statement about the spanning-tree portfast feature on the switch is true? 

A. If an interface is enabled for portfast receives BDPU, the port goes through the spanning-tree listening, learning, and forwarding states. 

B. If an interface is enabled for portfast receives BDPU, the port does not go through the spanning-tree listening, learning, and forwarding states. 

C. If an interface is enabled for portfast receives BDPU, the port is shut down immediately. 

D. If an interface is enabled for portfast receives BDPU, the port goes into the spanning-tree inconsistent state. 

Answer:


Q179. Refer to the exhibit. 

Which three statements about the output are true? (Choose three.) 

A. This switch is currently receiving a multicast data stream that is being forwarded out VLAN 150. 

B. A multicast receiver has requested to join one or more of the multicast groups. 

C. Group 224.0.1.40 is a reserved address, and it should not be used for multicast user data transfer. 

D. One or more multicast groups are operating in PIM dense mode. 

E. One or more of the multicast data streams will be forwarded out to neighbor 10.85.20.20. 

F. Group 239.192.1.1 is a reserved address, and it should not be used for multicast user data transfer. 

Answer: A,B,C 

Explanation: 

A. VLAN 150 shows up in the outgoing interface list so those specific multicast streams are being forwarded to this VLAN. 

B. A receiver has requested to receive the multicast stream associated with the multicast address of 239.192.1.1, that is why this stream appears in the mroute table. 

C. The 224.0.1.40 is a reserved multicast group for cisco's Rp descovery. All cisco routers are members of this grup by default and listen to this group for Cisco RP discovery messages advertised by mapping agent even if it is not configured 


Q180. Refer to the exhibit. 

Which technology can be used on the switch to enable host A to receive multicast packets for 239.2.2.2 but prevent host B from receiving them? 

A. IGMP filtering 

B. MLD snooping 

C. IGMP snooping 

D. MLD filtering 

Answer:

Explanation: 

IGMP snooping is the process of listening to Internet Group Management Protocol (IGMP) network traffic. The feature allows a network switch to listen in on the IGMP conversation between hosts and routers. By listening to these conversations the switch maintains a map of which links need which IP multicast streams. Multicasts may be filtered from the links which do not need them and thus controls which ports receive specific multicast traffic. 


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