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A host is attempting to send dat

题目

A host is attempting to send data to another host on a different network. What is the first action that the sending host will take?（）

  • A、Drop the data.
  • B、Send the data frames to the default gateway.
  • C、Create an ARP request to get a MAC address for the receiving host.
  • D、Send a TCP SYN and wait for the SYN ACK with the IP address of the receiving host.
参考答案和解析
正确答案:C
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相似问题和答案

第1题：

Click the Exhibit button.A user logs in, is assigned the default role, and successfully loads the Host Enforcer policies shown in the exhibit.Which three statements are true? ()

A. The local host will respond to ICMP echo-request packets from 192.168.53.10.

B. The local host will respond to UDP port 53 requests from 192.168.1.25.

C. The local host can send any packet of any type to host 172.16.1.1.

D. The local host will accept any packet of any type from host 172.16.1.1.

E. The local host can send packets to UDP port512 on server 192.168.53.10.


参考答案：A, C, D

第2题：

Refer to the exhibit.Switch－1 needs to send data to a host with a MAC address of 00b0.d056.efa4.What will Switch－1 do with this data?()

A.switch-1 will drop the data because it dose not have an entry for that MAC address

B.switch-1 will flood the data out all of its port from which the data originated

C.switch-1 will forward the data to its default gateway

D.tch-1 will send an ARP request out all its ports except the port from which the data originated


参考答案：B

第3题：

Please ______ these parcels by air at once.()

A. send up

B. send off

C. send away

D. send out


参考答案：B

第4题：

为读而打开文本文件aa.dat，的正确写法是（）

  • A、fopen（”aa.dat”，”rb”）；
  • B、fopen（”aa.dat”，”w”）
  • C、fopen（”aa.dat”，”wb”）；
  • D、fopen（”aa.dat”，”r”）

正确答案:D

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：

A host is attempting to send data to another host on a different network. What is the first action that the sending host will take?()

A. Drop the data.

B. Send the data frames to the default gateway.

C. Create an ARP request to get a MAC address for the receiving host.

D. Send a TCP SYN and wait for the SYN ACK with the IP address of the receiving host.


参考答案：C

第7题：

The user of Host1 wants to ping the DSL modem／router at 192.168.1.254. Based on the Host1 ARP table that is shown in the exhibit, what will Host1 do()。

A.send a unicast ARP packet to the DSL modem/router

B.send unicast ICMP packets to the DSL modem/router

C.send Layer 3 broadcast packets to which the DSL modem/router responds

D.send a Layer 2 broadcast that is received by Host2, the switch, and the DSL modem/router


参考答案：B

第8题：

You have created a Host Checker policy that contains multiple rules. You want to inform end users which rule specifically has failed.In the admin GUI, which configuration setting would you enable?()

A. Enable Custom Instructions

B. Pre-auth notification

C. Remediation message

D. Send reason strings


参考答案：D

第9题：

如果准备读文件，打开顺序文件“text.dat”的正确语句是（）。

Aopen ”text.dat” For write As # 1

Bopen ”text.dat” For Binary As # 1

Copen ”text.dat” For Input As # 1

Dopen ”text.dat” For Random As # 1


C
略

第10题：

Which statement is true of a source that wants to transmit multicast traffic to group 239.1.1.1？（）

  • A、Before sending traffic, it must first join  multicast group 239.1.1.1 by sending an IGMPv2 membership report to the default router on the local subnet.
  • B、It must send an IGMPv2 Request to Send  packet and then wait for an IGMPv2 Clear to Send packet from the IGMPv2 querier router on the local subnet
  • C、It may begin transmitting multicast traffic to the group only when there is no other host transmitting to the group on the local subnet.
  • D、It may transmit multicast traffic to the group at any time. 

正确答案:D

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