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Which command is used to enable EtherChannel hashing for Layer 3 IP and Layer 4 port-based
A. mpls ip cef
B. port-channel ip cef
C. mpls ip port-channel cef
D. port-channel load balance
E. mpls ip load-balance
F. ip cef EtherChannel channel-id XOR L4
G. ip cef connection exchange
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
Refer to the exhibit.
What triggered the first SPF recalculation?
A. changes in a router LSA, subnet LSA, and external LSA
B. changes in a router LSA, summary network LSA, and external LSA
C. changes in a router LSA, summary network LSA, and summary ASBR LSA
D. changes in a router LSA, summary ASBR LSA, and external LSA
Is built around links, and any IP prefix change in an area will trigger a full SPF. It advertises IP
information in Router and Network LSAs. The routers thus, advertise both the IP prefix information
(or the connected subnet information) and topology information in the same LSAs. This implies
that if an IP address attached to an interface changes, OSPF routers would have to originate a
Router LSA or a Network LSA, which btw also carries the topology information. This would trigger
a full SPF on all routers in that area, since the same LSAs are flooded to convey topological
change information. This can be an issue with an access router or the one sitting at the edge,
since many stub links can change regularly.
Only changes in interarea, external and NSSA routes result in partial SPF calculation (since type
3, 4, 5 and 7 LSAs only advertise IP prefix information) and thus IS-IS
Which two tunneling techniques support IPv6 multicasting? (Choose two.)
When IPv6 multicast is supported (over a 6to4 tunnel), an IPv6 multicast routing protocol must be
Restrictions for Implementing IPv6 Multicast
IPv6 multicast for Cisco IOS software uses MLD version 2. This version of MLD is fully backward-
compatible with MLD version 1 (described in RFC 2710). Hosts that support only MLD version 1
will interoperate with a router running MLD version 2. Mixed LANs with both MLD version 1 and
MLD version 2 hosts are likewise supported.
IPv6 multicast is supported only over IPv4 tunnels in Cisco IOS Release 12.3(2)T, Cisco IOS
(18)S, and Cisco IOS Release 12.0(26)S.
When the bidirectional (bidir) range is used in a network, all routers in that network must be able to
understand the bidirectional range in the bootstrap message (BSM).
IPv6 multicast routing is disabled by default when the ipv6 unicast-routing command is configured.
On Cisco Catalyst 6500 and Cisco 7600 series routers, the ipv6 multicast-routing also must be
enabled in order to use IPv6 unicast routing
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
Which command can be used on a PE router to connect to a CE router (188.8.131.52) in VRF red?
A. telnet 184.108.40.206 /vrf-source red
B. telnet 220.127.116.11 source /vrf red
C. telnet 18.104.22.168 /source vrf red
D. telnet 22.214.171.124 /vrf red
E. telnet 126.96.36.199 vrf red
Telnetting can be done through the VRF using the Management Ethernet interface. In the
following example, the router telnets to 172.17.1.1 through the Management Ethernet interface
Router# telnet 172.17.1.1 /vrf Mgmt-intf
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 three fields are optional in an OSPFv3 external LSA? (Choose three.)
A. Forwarding Address
B. External Route
C. Reference Link-State ID
E. Prefix Options
As with OSPFv2, the AS-External LSA advertises prefixes external to the OSPF routing domain;
one LSA is required for each external prefix advertised. However, the format of the OSPFv3 As-
External LSA (Figure 9-10) is different from its OSPFv2 counterpart.
Figure 9-10. OSPFv3 AS-External LSA
http://fengnet.com/book/CCIE Professional Development Routing TCPIP Volu
Apart from interdomain multicast routing, what else is MSDP used for?
A. Source Specific Multicast and IGMPv2
B. Announcing multicast sources to BGP speakers
C. Anycast RP
D. Intradomain multicast routing
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