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Q41. Refer to the exhibit.
Which three statements about this configuration are true? (Choose three.)
A. The default route appears in the global routing table.
B. The static route appears in the VRF red routing table.
C. The subnet 192.168.1.0 is unique to the VRF red routing table.
D. The static route is added to the global routing table and leaked from the VRF red.
E. The subnet 192.168.1.0 is unique to the global routing table.
F. 192.168.1.1 is reachable using any of the addresses on the router where the static route is configured.
Answer: A,B,E
Explanation:
This is an example of the route leaking feature. Here, this static route is created for the red VRF so it will be installed into the red VRF routing table, but the use of the global keyword will cause this default route to appear in the global routing table.
Q42. What is the destination MAC address of a BPDU frame?
A. 01-80-C2-00-00-00
B. 01-00-5E-00-00-00
C. FF-FF-FF-FF-FF-FF
D. 01-80-C6-00-00-01
Answer: A
Explanation:
The root-bridge election process begins by having every switch in the domain believe it is the root and claiming it throughout the network by means of Bridge Protocol Data Units (BPDU). BPDUs are Layer 2 frames multicast to a well-known MAC address in case of IEEE STP (01-80-C2-00-00-00) or vendor-assigned addresses, in other cases.
Reference: http://www.ciscopress.com/articles/article.asp?p=1016582
Q43. 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
Q44. Refer to the exhibit.
At which location will the benefit of this configuration be observed?
A. on Router A and its upstream routers B. on Router A and its downstream routers
C. on Router A only
D. on Router A and all of its ARP neighbors
Answer: B
Explanation:
The following example shows how to configure the router (and downstream routers) to drop all options packets that enter the network: Router(config)# ip options drop
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/sel_drop.html
Q45. Which two statements about packet fragmentation on an IPv6 network are true? (Choose two.)
A. The fragment header is 64 bits long.
B. The identification field is 32 bits long.
C. The fragment header is 32 bits long.
D. The identification field is 64 bits long.
E. The MTU must be a minimum of 1280 bytes.
F. The fragment header is 48 bits long.
Answer: A,B
Explanation:
The fragment header is shown below, being 64 bits total with a 32 bit identification field:
Reference: http://www.openwall.com/presentations/IPv6/img24.html
Renewal 400-101 download:
Q46. DRAG DROP
Drag and drop the MPLS term on the left to the function it performs on the right.
Answer:
Q47. Which statement describes the effect of the configuration line redistribute maximum-prefix 1500 90 withdraw?
A. After the 1500th route is redistributed, a warning is posted in the log file and 90 more routes are redistributed before further routes are discarded.
B. After the 1350th route is redistributed, a warning is posted in the log file until the 1500th route is redistributed, and then further routes are discarded.
C. After the 1500th route is redistributed, further routes are discarded only if the CPU is above 90%.
D. The routing protocol receives 1500 routes. After the routing process has redistributed 90% of the routes, the process supernets routes and injects a NULL route to prevent black-hole routing.
Answer: B
Q48. DRAG DROP
Drag and drop the multicast protocol definition on the left to the correct default time interval on the right.
Answer:
Q49. Refer to the exhibit.
Which configuration can you implement on PE-1 to allow CE-1 to receive delegated IPv6 prefixes?
A)
B)
C)
D)
E)
A. Exhibit A
B. Exhibit B
C. Exhibit C
D. Exhibit D
E. Exhibit E
Answer: A
Q50. A floating static route appears in the routing table of an interface even when the interface is unusable.
Which action can you take to correct the problem?
A. Remove the permanent option from the static route.
B. Correct the administrative distance.
C. Configure the floating static route to point to another route in the routing table.
D. Correct the DHCP-provided route on the DHCP server.
Answer: A