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A new backup connection is being deployed on a remote site router. The stability of the connection
has been a concern. In order to provide more information to EIGRP regarding this interface, you
wish to incorporate the “reliability” cost metric in the EIGRP calculation with the command metric
weights 1 0 1 0 1.
What impact will this modification on the remote site router have for other existing EIGRP
neighborships from the same EIGRP domain?
A. Existing neighbors will immediately begin using the new metric.
B. Existing neighbors will use the new metric after clearing the EIGRP neighbors.
C. Existing neighbors will resync, maintaining the neighbor relationship.
D. All existing neighbor relationships will go down.
Which two options are contained in a VTP subset advertisement? (Choose two.)
A. followers field
B. MD5 digest
C. VLAN information
D. sequence number
When you add, delete, or change a VLAN in a Catalyst, the server Catalyst where the changes are
made increments the configuration revision and issues a summary advertisement. One or several
subset advertisements follow the summary advertisement. A subset advertisement contains a list
of VLAN information.
If there are several VLANs, more than one subset advertisement can be required in order to
advertise all the VLANs.
Subset Advertisement Packet Format
This formatted example shows that each VLAN information field contains information for a different
VLAN. It is ordered so that lowered-valued ISL VLAN IDs occur first:
Most of the fields in this packet are easy to understand. These are two clarifications:
Which two options does Cisco PfR use to control the entrance link selection with inbound
optimization? (Choose two.)
A. Prepend extra AS hops to the BGP prefix.
B. Advertise more specific BGP prefixes (longer mask).
C. Add (prepend) one or more communities to the prefix that is advertised by BGP.
D. Have BGP dampen the prefix.
Explanation: PfR Entrance Link Selection Control Techniques
The PfR BGP inbound optimization feature introduced the ability to influence inbound traffic. A
network advertises reachability of its inside prefixes to the Internet using eBGP advertisements to
its ISPs. If the same prefix is advertised to more than one ISP, then the network is multihoming.
PfR BGP inbound optimization works best with multihomed networks, but it can also be used with
a network that has multiple connections to the same ISP. To implement BGP inbound
optimization, PfR manipulates eBGP advertisements to influence the best entrance selection for
traffic bound for inside prefixes. The benefit of implementing the best entrance selection is limited
to a network that has more than one ISP connection.
To enforce an entrance link selection, PfR offers the following methods:
BGP Autonomous System Number Prepend When an entrance link goes out-of-policy (OOP) due
to delay, or in images prior to Cisco IOS Releases 15.2(1) T1 and 15.1(2)S, and PfR selects a
best entrance for an inside prefix, extra autonomous system hops are prepended one at a time (up
to a maximum of six) to the inside prefix BGP advertisement over the other entrances. In Cisco
IOS Releases 15.2(1)T1, 15.1(2)S, and later releases, when an entrance link goes out-of policy
(OOP) due to unreachable or loss reasons, and PfR selects a best entrance for an inside prefix,
six extra autonomous system hops are prepended immediately to the inside prefix BGP
advertisement over the other entrances. The extra autonomous system hops on the other
entrances increase the probability that the best entrance will be used for the inside prefix. When
the entrance link is OOP due to unreachable or loss reasons, six extra autonomous system hops
are added immediately to allow the software to quickly move the traffic away from the old entrance
link. This is the default method PfR uses to control an inside prefix, and no user configuration is
BGP Autonomous System Number Community Prepend
When an entrance link goes out-of-policy (OOP) due to delay, or in images prior to Cisco IOS
(1)T1 and 15.1(2)S, and PfR selects a best entrance for an inside prefix, a BGP prepend
community is attached one at a time (up to a maximum of six) to the inside prefix BGP
advertisement from the network to another autonomous system such as an ISP. In Cisco IOS
Releases 15.2(1)T1, 15.1(2)S, and later releases, when an entrance link goes out-of-policy (OOP)
due to unreachable or loss reasons, and PfR selects a best entrance for an inside prefix, six BGP
prepend communities are attached to the inside prefix BGP advertisement. The BGP prepend
community will increase the number of autonomous system hops in the advertisement of the
inside prefix from the ISP to its peers. Autonomous system prepend BGP community is the
preferred method to be used for PfR BGP inbound optimization because there is no risk of the
local ISP filtering the extra autonomous system hops. There are some issues, for example, not all
ISPs support the BGP prepend community, ISP policies may ignore or modify the autonomous
system hops, and a transit ISP may filter the autonomous system path. If you use this method of
inbound optimization and a change is made to an autonomous system, you must issue an
outbound reconfiguration using the “clear ip bgp” command.
Refer to the exhibit.
A packet from RTD with destination RTG, is reaching RTB. What is the path this packet will take
from RTB to reach RTG?
A. RTB – RTA – RTG
B. RTB – RTD – RTC – RTA – RTG
C. RTB – RTF – RTE – RTA – RTG
D. RTB will not be able to reach RTG since the OSPF configuration is wrong.
Which two orders in the BGP Best Path Selection process are correct? (Choose two.)
A. Higher local preference, then lowest MED, then eBGP over iBGP paths
B. Higher local preference, then highest weight, then lowest router ID
C. Highest weight, then higher local preference, then shortest AS path
D. Lowest origin type, then higher local preference, then lowest router ID
E. Highest weight, then higher local preference, then highest MED
How will EIGRPv6 react if there is an IPv6 subnet mask mismatch between the Global Unicast
addresses on a point-to-point link?
A. EIGRPv6 will form a neighbor relationship.
B. EIGRPv6 will not form a neighbor relationship.
C. EIGRPv6 will form a neighbor relationship, but with the log MSG: “EIGRPv6 neighbor not on a
D. EIGRPv6 will form a neighbor relationship, but routes learned from that neighbor will not be
installed in the routing table.
Answer: A Explanation:
In order to maintain security, with which hop count are IPv6 neighbor discovery packets sent?
For which routes does LDP advertise a label binding?
A. all routes in the routing table
B. only the IGP and BGP routes in the routing table
C. only the BGP routes in the routing table
D. only the IGP routes in the routing table
Which type of domains is interconnected using Multicast Source Discovery Protocol?
Explanation: Multicast Source Discovery Protocol (MSDP) is a Protocol Independent Multicast
(PIM) family multicast routing protocol defined by Experimental RFC 3618. MSDP interconnects
multiple IPv4 PIM Sparse-Mode (PIM-SM) domains which enables PIM-SM to have Rendezvous
Point (RP) redundancy and inter-domain multicasting.
Refer to the exhibit.
Which interface(s) will show ip rpf 18.104.22.168 indicate as RPF interface(s)?
A. Ethernet 1/0
B. Ethernet 0/0
C. Both Ethernet 0/0 and Ethernet 1/0
D. RPF will fail
When troubleshooting multicast routing, the primary concern is the source address. Multicast has
a concept of Reverse Path Forwarding check (RPF check). When a multicast packet arrives on an
interface, the RPF process checks to ensure that this incoming interface is the outgoing interface
used by unicast routing to reach the source of the multicast packet. This RPF check process
prevents loops. Multicast routing does not forward a packet unless the source of the packet
passes a reverse path forwarding (RPF) check. Once a packet passes this RPF check, multicast
routing forwards the packet based only upon the destination address.
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