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When you are troubleshooting duplex mismatches, which two errors are typically seen on the full-
duplex end? (Choose two.)
B. FCS errors
C. interface resets
D. late collisions
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 three combinations are valid LACP configurations that will set up a channel? (Choose
Refer to the exhibit.
Which statement is correct about the prefix 184.108.40.206/8?
A. The prefix has encountered a routing loop.
B. The prefix is an aggregate with an as-set.
C. The prefix has been aggregated twice, once in AS 100 and once in AS 200.
D. None of these statements is true.
Refer to the exhibit.
Which path is selected as best path?
A. path 1, because it is learned from IGP B.
path 1, because the metric is the lowest C.
path 2, because it is external
D. path 2, because it has the higher router ID
In order to maintain security, with which hop count are IPv6 neighbor discovery packets sent?
Which command will define a VRF with name \’CCIE\’ in IPv6?
A. ip vrf CCIE
B. ipv6 vrf CCIE
C. vrf definition CCIE
D. ipv6 vrf definition CCIE
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 two statements are correct about Nonstop Forwarding? (Choose two.)
A. It allows the standby RP to take control of the device after a hardware or software fault on the
B. It is a Layer 3 function that works with SSO to minimize the amount of time a network is
unavailable to users following a switchover.
C. It is supported by the implementation of EIGRP, OSPF, RIPv2, and BGP protocols.
D. It synchronizes startup configuration, startup variables, and running configuration.
E. The main objective of NSF is to continue forwarding IP packets following a switchover.
F. Layer 2 802.1w or 802.1s must be used, as 802.1d cannot process the Layer 2 changes.
G. Routing protocol tuning parameters must be the same as the NSF parameters, or failover will
Cisco Nonstop Forwarding (NSF) works with the Stateful Switchover (SSO) feature in Cisco IOS
software. NSF works with SSO to minimize the amount of time a network is unavailable to its
users following a switchover. The main objective of Cisco NSF is to continue forwarding IP
packets following a Route Processor (RP) switchover.
Which two multicast address ranges are assigned as source-specific multicast destination
addresses and are reserved for use by source-specific applications and protocols? (Choose two.)
Explanation: Source-specific multicast (SSM) is a method of delivering multicast packets in which
the only packets that are delivered to a receiver are those originating from a specific source
address requested by the receiver. By so limiting the source, SSM reduces demands on the
network and improves security.
SSM requires that the receiver specify the source address and explicitly excludes the use of the (*,
G) join for all multicast groups in RFC 3376, which is possible only in IPv4\’s IGMPv3 and IPv6\’s
Source-specific multicast is best understood in contrast to any-source multicast (ASM). In the
ASM service model a receiver expresses interest in traffic to a multicast address. The multicast
1. discover all multicast sources sending to that address, and
2. route data from all sources to all interested receivers.
This behavior is particularly well suited to groupware applications where
1. all participants in the group want to be aware of all other participants, and
2. the list of participants is not known in advance.
The source discovery burden on the network can become significant when the number of sources
In the SSM service model, in addition to the receiver expressing interest in traffic to a multicast
address, the receiver expresses interest in receiving traffic from only one specific source sending
to that multicast address.
This relieves the network of discovering many multicast sources and reduces the amount of
multicast routing information that the network must maintain.
SSM requires support in last-hop routers and in the receiver\’s operating system. SSM support is
not required in other network components, including routers and even the sending host. Interest in
multicast traffic from a specific source is conveyed from hosts to routers using IGMPv3 as
specified in RFC 4607.
SSM destination addresses must be in the ranges 220.127.116.11/8 for IPv4 or FF3x::/96 for IPv6.
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