Multicast

Question 1

Mutlicast data packets that uses a special destination IP address known as a “Group Address”

Answer 1

Stream

Question 2

Addresses in the local network control
block are used for protocol control traffic that is not forwarded out a broadcast
domain

Answer 2

Local network control block (224.0.0/24)

Question 3

Addresses in the internetwork control
block are used for protocol control traffic that may be forwarded through the Internet.

Answer 3

Internetwork control block (224.0.1.0/24)

Question 4

This is the default range used by SSM

Answer 4

Source Specific Multicast (SSM) block (232.0.0.0/8)

Question 5

the protocol that receivers use to join
multicast groups and start receiving traffic from those groups

Answer 5

Internet Group Management Protocol (IGMP)

Question 6

works by examining IGMP joins sent by receivers and maintaining a table of interfaces to IGMP joins

Answer 6

IGMP snooping

Question 7

multicast routing protocol that routes multicast traffic between network segments

Answer 7

PIM (Protocol Independent Multicast)

Question 8

is a multicast distribution tree where the source is the root of the tree, and branches form a distribution tree through the network all the way down to the receivers.

Answer 8

source tree

Question 9

is a multicast distribution tree where the root of the shared tree is not the source but a router designated as the rendezvous point (RP).

Answer 9

shared tree

Question 10

There are currently five PIM operating modes:

Answer 10

PIM Dense Mode (PIM-DM)
PIM Sparse Mode (PIM-SM)
PIM Sparse Dense Mode

Question 11

the multicast tree is built by flooding traffic out every interface from the source to every Dense Mode router in the network

Answer 11

PIM Dense Mode

Question 12

uses an explicit join model where the receivers send an IGMP join to their locally connected router, which is also known as the last-hop router (LHR), and this join causes the LHR to send a PIM join in the direction of the root of the tree, which is either the RP in the case of a shared tree (RPT) or the first-hop router (FHR) where the source transmitting the multicast streams is connected in the case of an SPT

Answer 12

PIM Sparse Mode

Question 13

is a single common root placed at a chosen point of a shared distribution tree

Answer 13

Rendezvous Points

Question 14

Cisco proprietary mechanism that automates the distribution of group-to-RP mappings in a PIM network

Answer 14

Auto-RP

Question 15

described in RFC 5059, is a non-proprietary mechanism that provides a fault-tolerant, automated RP discovery and distribution mechanism

Answer 15

bootstrap router (BSR)