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Select two valid administratively scoped multicast addresses

题目
多选题
Select two valid administratively scoped multicast addresses in networks running Interior Gatewayprotocols like EIGRP and OSPF？（）
A

239.0.0.1

B

239.255.255.255

C

224.0.0.10

D

224.0.0.5

参考答案和解析
正确答案： C,A
解析： 暂无解析
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相似问题和答案

第1题：

Which two multicast IP addresses can be represented by the multicast MAC addre ss 0100.5e0A.0A07?()

A. 228.10.10.7

B. 229.11.10.7

C. 229.138.10.7

D. 229.138.10.8

E. 228.10.10.8

F. 228.10.138.7


参考答案：A, C

第2题：

Typically, an IP address refers to an individual host on a particular network. IP also accommodates addresses that refer to a group of hosts on one or more networks. Such addresses are referred to as multicast addresses, and the act of sending a packet from a source to the members of a （1）group is referred to as multicasting. Multicasting done （2）the scope of a single LAN segment is straightforward. IEEE 802 and other LAN protocols include provision for MAC-level multicast addresses. A packet with a multicast address is transmitted on a LAN Segment. Those stations that are members of the （3）multicast group recognize the multicast address and （4）the packet. In this case, only a single copy of the packet is ever transmitted. This technique works because of the （5）nature of a LAN: A transmission from any one station is received by all other station on the LAN.

空白（5）应选（ ）。

A. Multicast
B. unicast
C. broadcast
D. multiple unicast

答案：C
解析：
一般来说，一个IP地址对应网络上的一台主机。IP地址还能标识一组或多个网络上的主机组的地址，这种地址叫IP组播地址，把数据源发出的数据包传送给相应组播组成员的过程叫组播。组播在单一局域网段是直接传送的，使用IEEE802以及一些局域网协议如物理层协议。当包含一个组播地址的数据包在局域网段传输时，属于接收数据的组播组中的工作站能够识别这个地址并接收数据包。采用这种方式只需传送一份数据包副本，这是因为局域网是广播通信这个性质：即由一个工作站发出的数据可以被同一局域网内的所有工作站接收。

第3题：

Which two of the addresses below are available for host addresses on the Ezonexam subnet 192.168.15.19/28? (Select two answer choices)

A. 192.168.15.17

B. 192.168.15.14

C. 192.168.15.29

D. 192.168.15.16

E. 192.168.15.31

F. None of the above


正确答案：AC
A,C 解析：Explanation:
The network uses a 28bit subnet (255.255.255.240). This means that 4 bits are used for the networks and 4 bits for the hosts. This allows for 14 networks and 14 hosts (2n-2). The last bit used to make 240 is the 4th bit (16) therefore the first network will be 192.168.15.16.

The network will have 16 addresses (but remember that the first address is the network address and the last address is the broadcast address). In other words, the networks will be in increments of 16 beginning at 192.168.15.16/28. The IP address we are given is 192.168.15.19. Therefore the other host addresses must also be on this network. Valid IP addresses for hosts on this network are: 192.168.15.17-192.168.15.30.

Incorrect Answers:
B. This is not a valid address for this particular 28 bit subnet mask. The first network address should be 192.168.15.16.

D. This is the network address.

E. This is the broadcast address for this particular subnet.

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 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6题：

Which three IP addresses are valid multicast addresses?()

A. 169.254.23.59

B. 223.254.255.254

C. 225.1.1.1

D. 227.43.34.2

E. 238.3.3.3

F. 249.1.2.3


参考答案：C, D, E

第7题：

Which two multicast address ranges are assigned as source-specific multicast destination addresses and are reserved for use by source-specific applications and protocols？（）

  • A、232.0.0.0/8
  • B、239.0.0.0/8
  • C、232.0.0.0/4
  • D、FF3x：：/32
  • E、FF2x：：/32
  • F、FF3x：：/16

正确答案:A,D

第8题：

In which Spanning-Tree states does a switch port learn MAC addresses? (Select two)

A．Blocking

B．Listening

C．Forwarding

D．Learning

E．Relaying


正确答案：CD
解析：Explanation:
STP uses a couple of port states besides forwarding and blocking.
1. Listening - Listens to incoming Hello messages to ensure that there are no loops, but does not forward traffic. This is an interim state between blocking and forwarding.

2. Learning - Still listens to BPDUs, plus learns MAC addresses from incoming frames. It does not forward traffic. This is an interim state between blocking and forwarding.

3. Disabled - Administratively down.

第9题：

Select two valid administratively scoped multicast addresses in networks running Interior Gatewayprotocols like EIGRP and OSPF？（）

  • A、239.0.0.1
  • B、239.255.255.255
  • C、224.0.0.10
  • D、224.0.0.5

正确答案:A,B

第10题：

Which three IP addresses are valid multicast addresses?（）

  • A、169.254.23.59
  • B、223.254.255.254
  • C、225.1.1.1
  • D、227.43.34.2
  • E、238.3.3.3
  • F、249.1.2.3

正确答案:C,D,E

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