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Multicast Questions 2


Here you will find answers to Multicast Questions – Part 2
Question 1
Which action must be taken by a host if it wants to join a multicast group?
A. send an IGMPv2 membership report using unicast to the default router on the local subnet
B. send an IGMPv2 membership report using unicast to the rendezvous point for the group
C. send an IGMPv2 membership report using multicast to the “All-PIM-Routers” multicast group, 224.0.0.2, on the local subnet
D. send an IGMPv2 membership report using multicast on the local subnet with the destination IP address set to the multicast group being joined

Answer: D
Question 2
Which statement correctly describes Designated Forwarder in bidirectional PIM?
A. It has the best route to the rendezvous point and is the only router on the local subnet that may forward multicast traffic up the shared tree
B. It is responsible for forwarding all multicast traffic on to and off of the local subnet
C. It is elected based on the highest IP address of all PIM routers on the local subnet and is the only router on the local subnet that may forward multicast traffic up the shared tree
D. It has the best route to the rendezvous point and is the only router on the local subnet that may forward multicast traffic down the shared tree

Answer: A
Question 3
Why does the network administrator always avoid applying the multicast address 255.0.0.11 to multicast applications?
A. This Layer 3 IP multicast address is mapped to a layer 2 MAC address that will always be flooded to all ports of a Cisco Layer 2 switch
B. The address is reserved by the IANA for the Session Announcement Protocol
C. this is a link-local multicast address which is never forwarded beyond the local subnet
D. This address is reserved by the IANA for the Multicast Address Dynamic Client Allocation Protocol

Answer: A
Question 4
Refer to the following descriptions about anycast RPs. Which one is true?
A. Anycast RPs are unable to be used in conjunction with Auto-RPs
B. After a failure of one of the anycast RPs, the PIM network will reconverge on the remaining anycast RP or RPs in less than one second
C. After a failure of one of the anycast RPs, the PIM network will reconverge on the remaining anycast RP or RPs in roughly the same time that it takes unicast routing to reconverge
D. The anycast RPs should be within the same IGP domain

Answer: C
Question 5
IGMP has versions IGMP vl, v2 and v3. Which improvements does IGMPv3 offer over IGMPv2?
A. IGMPv3 added the ability for a host to specify which sources in a multicast group it wishes to receive
B. IGMPv3 added the ability for a host to specify which sources in a multicast group it does not wishes to receive
C. IGMPv3 removed the ability to perform a wildcard join of all sources in a multicast group
D. IGMPv3 removed the report-suppression feature for IGMP membership reports

Answer: A B D
Question 6
IANA is the central authority that maintains strict control on how IP addresses are used. Do you know the IP multicast addresses range it reserves for administratively scoped multicast?
A. 239.0.0.0 239.255.255.255
B. 233.0.0.0 233.255.255.255
C. 232 0.0.0 232.255.255.255
D. 224.0.0.0 224.0.0.255

Answer: A
Question 7
Each SPT (S,G) and shared tree (*,G) is defined as an entry in the multicast routing table. Once the table is built, any multicast packets received that match a specific (S,G) or (*,G) route entry will be forwarded out the outgoing interface list. Which addresses below can be used in the S entries?
A. Source Specific Multicast addresses
B. GLOP addresses
C. SDP / SAP addresses
D. any class A, class B, or class C host addresses

Answer: D
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