多选题In relation to MPLS Multicast VPN， which three statements about multicast distribution （MDT） groups aretrue？（）ADefault MDT groups are used for PIM control traffic， low-bandwidth sources， and flooding of sparse mode traffic.BMDTs are built in customer

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多选题

In relation to MPLS Multicast VPN， which three statements about multicast distribution （MDT） groups aretrue？（）

Default MDT groups are used for PIM control traffic， low-bandwidth sources， and flooding of sparse mode traffic.

MDTs are built in customer networks

Data MDT groups are used for high-bandwidth sources to reduce replication to uninterested PEs.

MDTs are built in provider networks

The number of MDTs depends on PIM modes of MDT groups.

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第1题：

Which three statements are true about the Internet Group Management Protocol (IGMP)? ()

A. There are three IGMP modes: dense mode, sparse mode, and sparse - dense mode

B. IGMP is used to register individual hosts with a multicast group

C. IGMP version 3 enables a multicast receiving host to specify to the router which sources it should forward traffic from

D. IGMP messages a re IP datagrams with a protocol value of 2, destination address of 224.0.0.2, and a TTL value of 1

E. IGMP is a multicast routing protocol that makes packet - forwarding decisions independent of other routing protocols such as EIGRP

F. IGMP snooping ru ns on Layer 3 routers

参考答案：B, C, D

第2题：

Which three IP multicast address related statements are true?（）

A、Multicast addresses 224.0.0.13 and 224.0.0.22 are reserved link - local addresses used by PIMv2 and IGMPv3
B、Because they would map to overlapping IP multicast MAC addresses, multicast addresses 224.0.1.1 and 238.1.1.1 could not be used toget her
C、Multicast addresses 224.0.0.0 through 224.0.0.255 are always forwarded because they are transmitted with Time to Live (TTL) greater than 1
D、Multicast addresses 224.0.0.5 and 224.0.0.6 are source multicast addresses for OSPF routers
E、The a dministratively scoped multicast addresses 239.0.0.0 through 239.255.255.255 are similar in purpose to RFC 1918 private unicast addresses
F、Multicast address 224.0.1.1 has been reserved for the Network Time Protocol (NTP) by the IANA

正确答案:A,E,F

第3题：

Which three mechanisims support the forwarding plane of a Layer 3 VPN in JUNOS software? ()

A. MPLS LSP

B. ATM tunnel

C. GRE tunnel

D. IPSEC tunnel

E. L2TPv3 session

参考答案：A, C, D

第4题：

Which three IP multicast address related statements are true？（Choose three.）（）

A、Multicast addresses 224.0.0.0 through 224.0.0.255 are always forwarded because they are transmitted with Time to Live （TTL） greater than 1.
B、Multicast addresses 224.0.0.5 and 224.0.0.6 are source multicast addresses for OSPF routers.
C、Multicast addresses 224.0.0.13 and 224.0.0.22 are reserved link-local addresses used by PIMv2 and IGMPv3.
D、Because they would map to overlapping IP multicast MAC addresses， multicast addresses 224.0.1.1 and 238.1.1.1 could not be used together.
E、Multicast address 224.0.1.1 has been reserved for the Network Time Protocol （NTP） by the IANA
F、The administratively scoped multicast addresses 239.0.0.0 through 239.255.255.255 are similar in purpose to RFC 1918 private unicast addresses.

正确答案:C,E,F

第5题：

Which two QoS classification and marking statements are true？（）

A、 In a Frame Relay network， delay sensitive traffic is tagged with the discard eligible （DE） bit.
B、 In an MPLS network， the three most significant bits of the DSCP or the IP precedence of the IP packet are copied into the MPLS EXP field
C、 In an MPLS network， the MPLS EXP bits are used to identify up to 16 CoS values.
D、 The differentiated services code point （DSCP） field consists of the first three bits of the IP precedence field in the header of an IP packet.
E、 The 802.10 standard uses a three bitfield referred to as the user priority bits （PRI） to mark packets as belonging to a specific CoS.

正确答案:B,E

第6题：

Which two QoS classification and marking statements are true？（）

A、 In a Frame Relay network， delay sensitive traffic is tagged with the discard eligible （DE） bit.
B、 In an MPLS network， the three most significant bits of the DSCP or the IP precedence of the IP packet are copied into the MPLS EXP field.
C、 In an MPLS network， the MPLS EXP bits are used to identify up to 16 CoS values.
D、 The differentiated services code point （DSCP） field consists of the first three bits of the IP precedence field in the header of an IP packet.
E、 The 802.1Q standard uses a three bit field referred to as the user priority bits （PRI） to mark packets as belonging to a specific CoS.

正确答案:B,E

第7题：

Cisco Configuration Assistant supports a variety of virtual private networks. Which three types of VPN can be configured by using CCA？（）

A、 DMVPN
B、 MPLS VPN
C、 IPv6 VPN
D、 Cisco IOS SSL VPN
E、 site-to-site VPN
F、 Cisco Easy VPN

正确答案:D,E,F

第8题：

What are three examples of a CPE－provisioned VPN? ()

A.L2TP

B.2547bis

C.L2F

D.PPTP

E.MPLS

参考答案：A, C, D

第9题：

Which three of these are major components of an MPLS VPN network？（）

A、LDP notification
B、L2TPv3 session
C、VPN route target communities
D、Multiprotocol BGP peering of PE routers
E、MPLS forwarding

正确答案:C,D,E

第10题：

Which three functions can CCC be used for？（）

A、To interconnect VLANS
B、To interconnect ATM VCs
C、To interconnect MPLS LSPs
D、To interconnect MPLS VPNs

正确答案:A,B,C

In relation to MPLS Multicast VPN， which three statements ab

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