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Q451. Refer to the exhibit.
ASN 64523 has a multihomed BGP setup to ISP A and ISP B. Which BGP attribute can you set to allow traffic that originates in ASN 64523 to exit the ASN through ISP B?
A. origin
B. next-hop
C. weight
D. multi-exit discriminator
Answer: D
Explanation:
MED is an optional nontransitive attribute. MED is a hint to external neighbors about the preferred path into an autonomous system (AS) that has multiple entry points. The MED is also known as the external metric of a route. A lower MED value is preferred over a higher value. Example at reference link below:
Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13759-37.html
Q452. DRAG DROP
Drag and drop each DHCP term on the left to the corresponding definition on the right.
Answer:
Q453. Which three statements about bridge assurance are true? (Choose three.)
A. Bridge assurance must be enabled on both ends of a link.
B. Bridge assurance can be enabled on one end of a link or on both ends.
C. Bridge assurance is enabled on STP point-to-point links only.
D. Bridge assurance is enabled on STP multipoint links only.
E. If a bridge assurance port fails to receive a BPDU after a timeout, the port is put into a blocking state.
F. If a bridge assurance port fails to receive a BPDU after a timeout, the port is put into an error disabled state.
Answer: A,C,E
Explanation:
Bridge Assurance is enabled by default and can only be disabled globally. Also, Bridge Assurance can be enabled only on spanning tree network ports that are point-to-point links.
Finally, both ends of the link must have Bridge Assurance enabled.
With Bridge Assurance enabled, BPDUs are sent out on all operational network ports, including alternate and backup ports, for each hello time period. If the port does not receive a BPDU for a specified period, the port moves into the blocking state and is not used in the root port calculation. Once that port receives a BPDU, it resumes the normal spanning tree transitions.
Reference:
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/configuration/guid e/cli/CLIConfigurationGuide/SpanningEnhanced.html
Q454. 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
Q455. DRAG DROP
Drag each statement about EtherChannel protocols on the left to the matching EtherChannel protocol on the right.
Answer:
Q456. Which two application protocols require application layer gateway support when using NAT on a Cisco router? (Choose two.)
A. SIP
B. HTTP
C. FTP
D. SMTP
E. POP3
Answer: A,C
Q457. Which statement is true about conditional advertisements?
A. Conditional advertisements create routes when a predefined condition is met.
B. Conditional advertisements create routes when a predefined condition is not met.
C. Conditional advertisements delete routes when a predefined condition is met.
D. Conditional advertisements create routes and withhold them until a predefined condition is met.
E. Conditional advertisements do not create routes, they only withhold them until a predefined condition is met.
Answer: E
Explanation:
The Border Gateway Protocol (BGP) conditional advertisement feature provides additional control of route advertisement, depending on the existence of other prefixes in the BGP table. Normally, routes are propagated regardless of the existence of a different path. The BGP conditional advertisement feature uses the non-exist-map and the advertise-map keywords of the neighbor advertise-map command in order to track routes by the route prefix. If a route prefix is not present in output of the non-exist-map command, then the route specified by the advertise-map command is announced. This feature is useful for multihomed networks, in which some prefixes are advertised to one of the providers only if information from the other provider is not present (this indicates a failure in the peering session or partial reachability).
Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/16137-cond-adv.html
Q458. Which two message types allow PIM snooping to forward multicast traffic? (Choose two.)
A. hello messages
B. leave messages
C. membership query messages
D. bidirectional PIM DF election messages
Answer: A,D
Q459. In which type of EIGRP configuration is EIGRP IPv6 VRF-Lite available?
A. stub
B. named mode
C. classic mode
D. passive
Answer: B
Explanation:
The EIGRP IPv6 VRF Lite feature provides EIGRP IPv6 support for multiple VRFs. EIGRP for IPv6 can operate in the context of a VRF. The EIGRP IPv6 VRF Lite feature provides
separation between routing and forwarding, providing an additional level of security because no communication between devices belonging to different VRFs is allowed unless it is explicitly configured. The EIGRP IPv6 VRF Lite feature simplifies the management and troubleshooting of traffic belonging to a specific VRF. The EIGRP IPv6 VRF Lite feature is available only in EIGRP named configurations.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6/configuration/15-2mt/ipv6-15-2mt-book/ip6-eigrp.html#GUID-92B4FF4F-2B68-41B0-93C8-AAA4F0EC1B1B
Q460. Which trunking configuration between two Cisco switches can cause a security risk?
A. configuring different native VLANs on the switches
B. configuring different trunk modes on the switches
C. configuring mismatched VLANs on the trunk
D. disabling DTP on the trunk ports
E. configuring incorrect channel-groups on the switches
Answer: A
