From: anthony.sequeira@thomson.com
Date: Fri Dec 08 2006 - 16:59:39 ART
LAST WEEK'S ANSWER:
Answer: c, d
Topic Domain: 7d
Issues:
What is the multicast TTL? How does the TTL Threshold work in multicast
environments?
Solutions:
Multicast TTL is a method for scoping multicast traffic. Multicast
packets have a TTL value that potentially controls their propagation. If
a router is configured with a threshold - the packet is not forwarded if
it has a TTL greater than the configured threshold. Another method of
scoping multicast traffic is to use the administrative multicast address
range.
More Information:
IP Multicast Troubleshooting Guide
http://www.cisco.com/warp/public/105/mcastguide0.html#ttlthreshold
LAST WEEK'S QUESTION:
7-7-5. An administrator in your network has configured the ip multicast
ttl-threshold command on a router and set the TTL Threshold to 12. Which
of the following TTL values of packets will trigger a packet drop?
Choose all that apply.
a. 6
b. 12
c. 13
d. 15
THIS WEEK'S QUESTION:
3-10-1. You have made the partial configuration shown in Exhibit 1. You
are on a client PC configured with R1 as the default gateway and you are
trying to ping a destination in the 24::/64 network. The ping is not
successful. What is the most likely problem?
a. There are no tunnel destinations configured for the tunnel
endpoints
b. The tunnel endpoints must be configured with IPv4 addresses
and IPv6 tunnel source addresses
c. This tunnel mode has been deprecated and is no longer
supported on a Cisco router
d. The static route should point to the IPv6 next hop address of
the tunnel endpoint
e. This tunnel mode cannot be configured for intrasite
connectivity
Exhibit 1
R1:
interface Tunnel12
no ip address
ipv6 address 2002:AC10:6501::/128
tunnel source 172.16.101.1
tunnel mode ipv6ip 6to4
!
ipv6 route 24::/64 tunnel 12
R2:
interface Tunnel12
no ip address
ipv6 address 2002:AC10:6601::/128
tunnel source 172.16.102.1
tunnel mode ipv6ip 6to4
Question of the Week Compliments of:
TESTiT
http://www.netmasterclass.com/site/written.php
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