Chapter 15 Quiz

1		A one-to-all communication between one source and all hosts on a network is classified as a _______ communication.
			A)	unicast
			B)	multicast
			C)	broadcast
			D)	none of the above
2		A one-to-many communication between one source and a specific group of hosts is classified as a _______ communication.
			A)	unicast
			B)	multicast
			C)	broadcast
			D)	none of the above
3		A one-to-one communication between one source and one destination is classified as a _______ communication.
			A)	unicast
			B)	multicast
			C)	broadcast
			D)	none of the above
4		In ______, the router forwards the received packet through only one of its interfaces.
			A)	unicasting
			B)	multicasting
			C)	broadcasting
			D)	none of the above
5		In _______, the router may forward the received packet through several of its interfaces.
			A)	unicasting
			B)	multicasting
			C)	broadcasting
			D)	none of the above
6		Emulation of ________ through ___________ is not efficient and may create long delays.
			A)	unicasting; multiple unicasting
			B)	multicasting; multiple unicasting
			C)	broadcasting; multicasting
			D)	none of the above
7		In unicast routing, each router in the domain has a table that defines a ______ path tree to possible destinations.
			A)	average
			B)	longest
			C)	shortest
			D)	none of the above
8		In multicast routing, each involved router needs to construct a ________ path tree for each group.
			A)	average
			B)	longest
			C)	shortest
			D)	none of the above
9		In the _______ tree approach, each router needs to have one shortest path tree for each group.
			A)	group-shared
			B)	source-based
			C)	a or b
			D)	none of the above
10		In the group-shared tree approach, _________ involved in multicasting.
			A)	only the core router is
			B)	all routers are
			C)	only some routers are
			D)	none of the above
11		Multicast link state routing uses the _______ tree approach.
			A)	source-based
			B)	group-shared
			C)	a or b
			D)	none of the above
12		The Multicast Open Shortest Path First (MOSPF) protocol is an extension of the OSPF protocol that uses multicast routing to create source-based trees. The protocol is based on _______ routing.
			A)	distance vector
			B)	link state
			C)	path vector
			D)	none of the above
13		MOSPF is a _______ protocol.
			A)	data-driven
			B)	command-driven
			C)	both a and b
			D)	none of the above
14		_________ broadcasts packets, but creates loops in the systems.
			A)	Forwarding
			B)	Flooding
			C)	Backwarding
			D)	none of the above
15		In RPF, a router forwards only the copy that has traveled the _______ path from the source to the router.
			A)	shortest
			B)	longest
			C)	average
			D)	none of the above
16		RPF eliminates the ________ in the flooding process.
			A)	forwarding
			B)	backwarding
			C)	flooding
			D)	none of the above
17		RPF guarantees that each network receives only ____ of the multicast packet.
			A)	one copy
			B)	two copies
			C)	a or b
			D)	none of the above
18		RPB creates a shortest path _______ tree from the source to each destination.
			A)	unicast
			B)	multicast
			C)	broadcast
			D)	none of the above
19		RPB guarantees that each destination receives _________ of the packet.
			A)	one copy
			B)	no copies
			C)	multiple copies
			D)	none of the above
20		In ________, the multicast packet must reach only those networks that have active members for that particular group.
			A)	RPF
			B)	RPB
			C)	RPM
			D)	none of the above
21		_______ adds pruning and grafting to _______ to create a multicast shortest path tree that supports dynamic membership changes.
			A)	RPM; RPB
			B)	RPB; RPM
			C)	RPF: RPM
			D)	none of the above
22		__________ is an implementation of multicast distance vector routing. It is a source-based routing protocol, based on RIP.
			A)	MOSPF
			B)	DVMRP
			C)	CBT
			D)	none of the above
23		DVMRP is a ________routing protocol, based on RIP.
			A)	source-based
			B)	group-shared
			C)	both a and b
			D)	none of the above
24		Pruning and grafting are strategies used in _______.
			A)	RPF
			B)	RPB
			C)	RPM
			D)	none of the above
25		A _______ message tells an upstream router to stop sending multicast messages for a specific group through a specific router.
			A)	weed
			B)	graft
			C)	prune
			D)	none of the above
26		A _______ message tells an upstream router to start sending multicast messages for a specific group through a specific router.
			A)	weed
			B)	graft
			C)	prune
			D)	none of the above
27		CBT is a ________ protocol that uses a core as the root of the tree.
			A)	source-based
			B)	group-shared
			C)	a or b
			D)	none of the above
28		PIM-DM is used in a _______ multicast environment, such as a LAN.
			A)	dense
			B)	sparse
			C)	a or b
			D)	none of the above
29		PIM-SM is used in a _______multicast environment such as a WAN.
			A)	dense
			B)	sparse
			C)	a or b
			D)	none of the above
30		In _______, a logical tunnel is established by encapsulating the multicast packet inside a unicast packet.
			A)	UNIBONE
			B)	MULTBONE
			C)	MBONE
			D)	none of the above