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When an IPv6 enabled host boots, it sends a router solicitat

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When an IPv6 enabled host boots, it sends a router solicitation (RS) message. An IPv6 router responds with a router advertisement (RA). Which two items are c ontained in the RA?（）
A

any route advertisements it has received

B

prefixes for the link

C

keepalive timers

D

IPv6 address for the host

E

request for the local host IP address

F

lifetime of the prefix

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相似问题和答案

第1题：

Which two statements are true about using IPv4 and IPv6 simultaneously on a network segment? ()

A. IPv6 allows a host to create its own IPv6 address that will allow it to communicate to other devices on a network configured via DHCP. IPv4 does not provide a similar capability for hosts.

B. IPv6 provides for more host IP addresses but IPv4 provides for more network addresses.

C. Hosts can be configured to receive both IPv4 and IPv6 addresses via DHCP.

D. Host configuration options for IPv4 can be either statically assigned or assigned via DHCP.Host configuration options for IPv6 can be statically assigned only.

E. IPv4 and IPv6 addresses c an be simultaneously assigned to a host but not to a router interface.


参考答案：A, C

第2题：

When an IPv6 enabled host boots, it sends a router solicitation (RS) message. An IPv6 router responds with a router advertisement (RA).Which two items are c ontained in the RA?()

A. any route advertisements it has received

B. prefixes for the link

C. keepalive timers

D. IPv6 address for the host

E. request for the local host IP address

F. lifetime of the prefix


参考答案：B, F

第3题：

What are two instances when a WX device route carves? ()(Choose two.)

A. It occurs every 29 hours.

B. Packet interception mode is enabled.

C. The host is unreachable on the local subnet.

D. The subnet is unreachable using the advertised router.


参考答案：C, D

第4题：

What is the first thing that happens when IPv6 is enabled on an interface on a host？（）

  • A、A router solicitation is sent on that interface.
  • B、There is a duplicate address detection on the host interface.
  • C、The link local address is assigned on the host interface.
  • D、A neighbor redirect message is sent on the host interface.

正确答案:B

第5题：

Anytime a host or a router has an IP datagram to send to another host or router, it has the（　）address of the receiver. This address is obtained from the DNS if the sender is the host or it is found in a routing table if the sender is a router. But the IP data gram must be（　） in a frame to be able to pass through the physical network. This means that the sender needs the （　）address of the receiver. The host or the router sends an ARP query packet. The packet includes the physical and IP addresses of the sender and the IP address of the receiver. Because the sender does not know the physical address of the receiver, the query is（　） over the network.Every host or router on the network receives and processes the ARP query packet, but only the intended recipient recognizes its IP address and sends back an ARP response packet.The response packet contains the recipient's IP and physical addresses. The packet is（请作答此空） directly to the inquirer by using the physical address received in the query packet.

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

答案：B
解析：
任何时候主机或路由器要发送 IP 数据报发送给另一主机或路由器时，都需要知道接收方的逻辑地址。发送主机从 DNS 获得该地址，发送路由器则在路由表中找到该地址。但 IP 数据报必须封装在帧中才能通过物理网络。这意味着发送者需要知道接收者的物理地址。主机或路由器需发送 ARP 查询报文，该报文分组包含发送者的物理地址和 IP 地址及接收者的 IP 地址。这是因为送者不知道接收者的物理地址，所以需在全网广播报文。网络上的每个主机或路由器都能接收并处理该 ARP 查询报文，但只有预期的接收者识别其 IP 地址并响应该 ARP 报文。响应报文包含接收者的 IP 地址和物理地址。包含了接收者物理地址的响应报文分组通过单播的方式直接发送给发送者。

第6题：

Which command must be globally enabled on a Cisco router to support IPv6?()

A. ip routing ipv6

B. ipv6 unicast - routing

C. ipv6 routing

D. ip classless

E. ipv6 cef


参考答案：B

第7题：

Refer to the exhibit. When running OSPF, What would cause router A not to form an adjacency with router B?()

A.The loopback addresses are on different subnets

B.The value of the dead timers on the router are different

C.Route summarization is enabled on both routers

D.The process indentifier on router A is different than the process identifier on router B


参考答案：B

第8题：

is a protocol that a host uses to inform. a router when it joins or leaves an Internet multicast group。

A．SMTP

B．ICMP

C．MIME

D．IGMP


正确答案：D
解析：IGMP协议是接收者发现协议，它运行在主机和路由器之间，用于路由器维护组播组是否有组成员。

第9题：

The TTL field was originally designed to hold a time stamp, which was decremented by each visited router. The datagram was ( ) when the value became zero. However, for this scheme, all the machines must have synchronized clocks and must know how long it takes for a datagram to go from one machine to another. Today, this field is used mostly to control the ( ) number of hops (routers) visited by the datagram. When a source host sends the datagram, it ( ) a number in this field. Each router that processes the datagram decrements this number by 1. If this value, after being decremented, is zero, the router discards the datagram.This field is needed because routing tables in the Internet can become corrupted.A datagram may travel between two or more routers for a long time without ever getting delivered to the (请作答此空).This field limits the ( ) of a datagram.

A.switch
B.router
C.source host
D.destination host

答案：D
解析：
TTL的基本概念。

第10题：

What protocol specified by RFC 1256 will allow an enabled IP host a new router when a router  becomes unavailable？ （）

  • A、 IRDP
  • B、 SNMP
  • C、 HSRP
  • D、 VRRP

正确答案:A

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