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单选题Given the following routing table entries， which of the following will the next-hop address be for a packet destined for the address 192.168.1.203？（）A 77.0.5.5B 40.40.0.254C 66.40.90.121D 72.40.91.1

题目
单选题
Given the following routing table entries， which of the following will the next-hop address be for a packet destined for the address 192.168.1.203？（）
A

77.0.5.5

B

40.40.0.254

C

66.40.90.121

D

72.40.91.1

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相似问题和答案

第1题：

Using the routing table shown in the exhibit, what will be the next－hop IP address used for a destination IP address of 192.168.1.1?()

A. 10.20.14.130

B. 10.18.1.1

C. 10.20.14.131

D. 10.20.106.10


参考答案：D

第2题：

Given the routing entries shown in the exhibit, which next－hop IP address will be used for die destination IP address 192.168.1.142? ()

A. 10.20.106.10

B. 10.20.14.131

C. 10.181.1

D. 10.20.14.130


参考答案：D

第3题：

阅读下面的短文，回答问题 [When an IP packet arrives at a router, generally the router looks at the destination address of the packet, and forwards the packet to one of its network interfaces. The forwarding decision is usually done by looking up the destination address from another data structure called a forwarding table. The forwarding table is created by the router using the routing table and possible routing policies existing in the router. The router then creates a table where it lists which networks are accessible through which of the router’s network interfaces. An IP router looks at every IP packet individually and does the forwarding decision on a packet-by-packet basis. If something changes in the router’s routing table, a packet can take a different route from a preceding packet even if it has the same destination.] From the paragraph above，we can see that the router （ ） a forwarding table according to the routing table and possible routing policies existing in the router. When an IP packet arrives at a router, the （ ） part of packet is normally checked by the router. An IP router checks every IP Packet individually and makes the forwarding decision based on （ ）.

A．is generating B．generate C．is generated D．generates A．forwarding table B．network interfaces C．routing policies D．destination address A．the destination address and network interfaces B．forwarding table and network interfaces C．the destination address and forward table D．routing policies and routing table


正确答案：D,D,C

第4题：

You suspect that a hacker may be performing a MAC address flooding attack somewhere within the    network.  Which description correctly describes a MAC address flooding attack？（）

  • A、The attacking device spoofs a source MAC address of a valid host currently in the CAM table. The switch then forwards frames destined for the valid host to the attacking device.
  • B、Frames with unique， invalid destination MAC addresses flood the switch and exhaust CAM table space. The result is that new entries cannot be inserted because of the exhausted CAM table space， and traffic is subsequently flooded out all ports.
  • C、The attacking device crafts ARP replies intended for valid hosts. The MAC address of the attacking device then becomes the destination address found in the Layer 2 frames sent by the valid network device.
  • D、The attacking device crafts ARP replies intended for valid hosts. The MAC address of the attacking device then becomes the source address found in the Layer 2 frames sent by the valid network device.
  • E、The attacking device spoofs a destination MAC address of a valid host currently in the CAM table. The switch then forwards frames destined for the valid host to the attacking device.
  • F、Frames with unique， invalid source MAC addresses flood the switch and exhaust CAM table space. The result is that new entries cannot be inserted because of the exhausted CAM table space， and traffic is subsequently flooded out all ports.
  • G、None of the other alternatives apply

正确答案:F

第5题：

Select the 3 best answers describing operation and configuration of Frame-Relay Inverse ARP.（）

  • A、Dynamic address mapping uses Frame Relay Inverse ARP to request the next-hop protocol address for a specific connection on its known DLCI
  • B、Responses to Inverse ARP requests are entered in an address-to-DLCI mapping table on the router or access server which is used to supply the next-hop protoco address or the DLCI for outgoing traffic
  • C、Inverse ARP is enabled by default for all protocols enabled on the physical interface
  • D、Inverse ARP is configured using the following command under the Interface configuration ’frame-relaymap dlci （dlci number） protocol protocol-address’
  • E、Inverse ARP in Frame-Relay is synonymous of ARP in Ethernet

正确答案:A,B,C

第6题：

Given the routing entries shown in the exhibit, which next－hop IP address will be used for the destination IP address 192.168.1.159?()

A. 10.20.14.130

B. 10.18.1.1

C. 10.20.14.131

D. 10.20.106.10


参考答案：D

第7题：

Given the address 192.168.20.19／28, which of the following are valid host addresses on this subnet?()

A.192.168.20.29

B.192.168.20.16

C.192.168.20.17

D.192.168.20.31

E.192.168.20.0


参考答案：A, C

第8题：

Router VE1 has just received a packet and needs to route it. What two actions must this router take in order to route incoming packets? (Choose two)

A. Inspect the routing table to select the best path to the destination network addresses.

B. Validate sources of routing information.

C. Inspect the ARP table to verify a legitimate source MAC address for each packet.

D. Identify the destination network address of each packet.

E. Verify the receipt of routed packets by the next hop router.

F. Identify the source network address of each packet.


正确答案：AD
A,D 解析：Explanation:
The router decides how to forward an incoming packet by finding the routes that "match" the destination address of the packet, and then forwarding it according to the most narrowly applicable one.

A packet matches a route in the following way: a packet has (among other things) a destination address in its header, a route contains either a network or a host address, a network mask (netmask), and instructions on how to forward a packet using the route.

The packet matches the route if its destination address is part of the address subspace defined by the network address or exactly matches the host address of the route. A route is more narrowly applicable than another if the address subspace defined by its network address contains fewer actual addresses than the other, which is indicated by the netmask. An entry with a host address, rather than a network address, is the narrowest kind.

第9题：

When an ICMP redirect is received， which of the following options is the most appropriate to conclude？（）

  • A、A routing table has changed
  • B、The IP address has changed
  • C、The system has become a gateway
  • D、A hacker is posing a threat to the system

正确答案:A

第10题：

Which of the following characteristics are common to both RIPv2 and RIPng？（Choose all thatapply.）（）

  • A、Link-local address used for next-hop addresses
  • B、Interface can be added to RIP routing process in either interface configuration mode or in routerconfiguration mode
  • C、Uses a multicast to send routing updates
  • D、Use hop count as a metric
  • E、Distance-vector routing protocol
  • F、Maximum hop count is 15 with 16 being "unreachable"

正确答案:C,D,E,F

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