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Q371. Which two methods change the IP MTU value for an interface? (Choose two.)
A. Configure the default MTU.
B. Configure the IP system MTU.
C. Configure the interface MTU.
D. Configure the interface IP MTU.
Answer: C,D
Explanation:
An IOS device configured for IP+MPLS routing uses three different Maximum Transmission Unit (MTU) values: The hardware MTU configured with the mtu interface configuration command
. The IP MTU configured with the ip mtu interface configuration command
. The MPLS MTU configured with the mpls mtu interface configuration command
The hardware MTU specifies the maximum packet length the interface can support … or at least that's the theory behind it. In reality, longer packets can be sent (assuming the hardware interface chipset doesn't complain); therefore you can configure MPLS MTU to be larger than the interface MTU and still have a working network. Oversized packets might not be received correctly if the interface uses fixed-length buffers; platforms with scatter/gather architecture (also called particle buffers) usually survive incoming oversized packets.
IP MTU is used to determine whether am IP packet forwarded through an interface has to be fragmented. It has to be lower or equal to hardware MTU (and this limitation is enforced). If it equals the HW MTU, its value does not appear in the running configuration and it tracks the changes in HW MTU. For example, if you configure ip mtu 1300 on a Serial interface, it will appear in the running configuration as long as the hardware MTU is not equal to 1300 (and will not change as the HW MTU changes). However, as soon as the mtu 1300 is configured, the ip mtu 1300 command disappears from the configuration and the IP MTU yet again tracks the HW MTU.
Reference: http://blog.ipspace.net/2007/10/tale-of-three-mtus.html
Q372. Which option is the result if two adjacent routers are configured for OSPF with different process IDs?
A. The routers are unable to establish an adjacency.
B. The routers establish an adjacency, but route exchange fails.
C. The routers establish an adjacency and exchange routes, but the routes are unreachable.
D. The routers establish an adjacency and exchange routes, and the routes are reachable.
Answer: D
Q373. Refer to the exhibit.
Which two statements about this configuration are true? (Choose two.)
A. Pings from SW2 to SW1 fail because SW1 is pruning VLAN 10.
B. VLANs 10 and 200 are added to the SW2 allowed list on interface fa0/22.
C. Pings from SW2 to SW1 are successful.
D. Only VLAN 200 is added to the SW1 allowed list on interface fa0/22.
Answer: B,C
Q374. Refer to the exhibit.
With these configurations for R1 and R2, which statement about PPP authentication is true?
A. Authentication fails because R1 is missing a username and password.
B. R2 responds with the correct authentication credentials.
C. R2 requires authentication from R1.
D. R1 requires authentication from R2.
Answer: C
Explanation:
Only R2 is configured with the “PPP authentication PAP” command so it requires authentication from R1, but R1 does not require authentication from R2.
Q375. Which term describes an EIGRP route that has feasible successors?
A. active
B. passive
C. redistributed
D. invalid
Answer: B
Explanation:
A topology table entry for a destination can have one of two states. A route is considered in the Passive state when a router is not performing a route recomputation. The route is in Active state when a router is undergoing a route recomputation. If there are always feasible successors, a route never has to go into Active state and avoids a route recomputation.
When there are no feasible successors, a route goes into Active state and a route recomputation occurs. A route recomputation commences with a router sending a query packet to all neighbors. Neighboring routers can either reply if they have feasible successors for the destination or optionally return a query indicating that they are performing a route recomputation. While in Active state, a router cannot change the next-hop neighbor it is using to forward packets. Once all replies are received for a given query, the destination can transition to Passive state and a new successor can be selected.
Reference: http://docwiki.cisco.com/wiki/Enhanced_Interior_Gateway_Routing_Protocol
Q376. Refer to the exhibit.
Which BGP feature allows R1 to send R2 a list of prefixes that R2 is prevented from advertising to R1?
A. route refresh
B. Prefix-Based Outbound Route Filtering
C. distribute lists
D. prefix lists
Answer: B
Q377. DRAG DROP
Drag and drop the multiprotocol BGP feature on the left to the corresponding description on the right.
Answer:
Q378. With AutoInstall, which mechanism allows for automatic addressing of the serial interface using HDLC?
A. ARP
B. BOOTP
C. DHCP
D. SLARP
Answer: D
Q379. Which statement about the VLAN database is true?
A. Manually deleting the vlan.dat file can cause inconsistency in the database.
B. Private VLAN information is stored in the database.
C. VLAN configurations 1 through 4096 are stored in the vlan.dat file.
D. The VLAN database is used only if the VTP domain name in the VLAN database matches the VTP domain name in the startup-config file.
Answer: A
Q380. Which two statements about the function of PIM designated router are true? (Choose two.)
A. It registers directly connected source to the PIM rendezvous point.
B. It sends PIM asserts on the interface of the outgoing interface list.
C. It sends PIM Join/Prune messages for directly connected receivers.
D. It forwards multicast traffic from the source into the PIM network.
E. It sends IGMP queries.
Answer: A,C