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NEWS BROADCAST 1　　Questions 6 and 7 are based on the followi

题目
单选题
NEWS BROADCAST 1　　Questions 6 and 7 are based on the following news. At the end of the news item, you will be given 20 seconds to answer the questions. 　　Now listen to the news. Greek bonds is downgraded as junk status because
A

share prices in New York and London fell by over 2％.

B

the Greek debt crisis could spread to other countries.

C

the bond holders may not be repaid in full.

D

Greek bonds could trigger a financial crisis.

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相似问题和答案

第1题：

VE1 is a switch in the Ezonexam network. Why will VE1 never learn the broadcast address?

A. Broadcast frames are never sent to switches

B. A broadcast frame. is never forwarded by a switch

C. Broadcasts only use network layer addressing

D. A broadcast address will never be the source address of a frame

E. Broadcast addresses use an incorrect format for the switching table

F. None of the above


正确答案：D
D

第2题：

Refer to the exhibit. Based on the output from the show command on RT1which statement is true? ()

A. OSPFv3 uses global IPv6 addresses to establish neighbor adjacencies.

B. RT1 has a subnet mask of 64 bits .

C. RT1 has FastEthernet0/0 set as a DR for network type broadcast.

D. OSPFv3 uses Link - local addresses to establish neighbor adjacencies.

E. RT1does not have a global IPv6 address set on FastEthernet0/0.

F. OSPFv3 uses IPv4 addresses to establish nei ghbor adjacencies.


参考答案：D

第3题：

The reason why lesson six skips the puzzle questions is that they are associated with the expertise based on the content of a particular subject which is likely irrelevant to a layman.()


参考答案：对

第4题：

What are three benefits of implementing vlans？（）

  • A、A more efficient use of bandwidth can be achieved allowing many physical groups to use the same network infrastructure
  • B、Broadcast storms can be mitigated by decreasing the number of broadcast domains，thus increasing their size
  • C、A higher level of network security can be reached by separating sensitive data traffic from other network traffic
  • D、Port-based vlans increase switch-port use efficient，thanks to 802.1Q trunks
  • E、A more efficient use of bandwidth can be achieved allowing many logical networks to use the same network infrastructure
  • F、Broadcast storms can be mitigated by increasing the number of broadcast domains，thus reducing theirsize
  • G、VLANs make it easier for IT staff to configure new logical groups，because the vlans all belong to thesame broadcast domain

正确答案:C,E,F

第5题：

Questions 47-49 refer to the following letter.
Tampa Daily News - Available in Print and Online
The Tampa Daily News has two versions of its printed newspaper available online.One version ______ the printed edition, including the editorial and news pages.

A. is the same

B. has the same

C. is the same as

D. as has the same

答案：C
解析：

第6题：

请将主机ns.test.com的/etc/sysconfig/network-scripts/ifcfg-eth0文件的(6)～(7)空缺处的配置内容填写完整，请回答相关问题：

DEVICE=eth0

IPADDR=(6)

NETMASK=255.255.255.0

NETWORK=(7)

BROADCAST=255.255.255.255

NBOOT=yes

若将“BROADCAST=255.255.255.255”语句修改为“BROADCAST=192.168.1.255”，则对网络有什么影响? (请简要说明理由)


正确答案：(6)192.168.1.3 (7)192.168.1.0 采用直接广播地址的广播分组可能会被路由器转发外部网络用户可截获该广播分组降低了网络的安全性
(6)192.168.1.3 (7)192.168.1.0 采用直接广播地址的广播分组可能会被路由器转发，外部网络用户可截获该广播分组，降低了网络的安全性 解析：在图3-8中主机ns.test.com一个完整的/etc/sysconfig/network-scripts/ifcfg-eth0文件清单如下：
DEVICE=eth0/*指明网卡的名称*/
IPADDR=192.168.1.3/*指明分配给网卡的IP地址*/
NETMASK=255.255.255.0/*指明子网掩码，该子网有254个可用的IP地址*/
NETWORK=192.168.1.0/*指明网络地址*/
BROADCAST=255.255.255.255/*指明直接广播地址*/
NBOOT=yes/*指明在系统启动时是否激活网卡*/
BOOTPROTO=none/*指明是否使用bootp协议*/
TCP/IP协议规定，将IP地址中表达主机部分的各位全部设置为“1”的IP地址称为该主机的直接广播地址。对于本试题IP地址192.168.1.3/24的直接广播地址的二进制数形式为11000000.10101000. 00000001.11111111，其相应的十进制数形式为192.168.1.255。由此可见，直接广播地址包含一个有效的网络号和主机号，可在两个子网之间的任何一个节点向其他任何网络进行直接广播，但其有两个缺点：一个是需要知道信宿网络的网络号；另一个是采用直接广播地址的广播分组可能会被路由器转发，即外部网络的用户将会截取到这种广播分组，从而降低了网络的安全性。
如果只需在本子网内部进行信息广播，但又不知道本子网的网络号时，则可利用将整个IP地址二进制比特位全部设置为“1”的本地广播地址，即255.255.255.255。本地广播地址用于本子网发送广播信息，即本地网络地址相同的主机均能收到其所在子网的广播包，其相应的广播分组不会被路由器转发。
一旦配置完Linux网关计算机的网络配置文件，应该使用/etc/rc.d/init.d/network restart命令来重新启动网络，以使其修改生效。

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：

Questions 59-60 are based on the following information

A hash table With hash function

H1(k)=k mod 13

Is shown below．

Collision is resolved using the hash function H2(k)=(k mod 11)+1

How many key comparisons occur in searching for key 35 in the given hash table?

A．0

B．1

C．2

D．3


正确答案：D

第9题：

Which best represents a typical attackthat takes advantage of RFC 792， ICMPType 3 messages？（）

  • A、 Blind connection-reset
  • B、 Large packet echo request
  • C、 Packet fragmentation offset
  • D、 Broadcast-based echo request
  • E、 Excessive bandwidth consumption

正确答案:A

第10题：

What are two advantages of Layer 2 Ethernet switches over hubs?（）

  • A、decreasing the number of collision domains
  • B、filtering frames based on MAC addresses
  • C、allowing simultaneous frame transmissions
  • D、increasing the size of broadcast domains
  • E、increasing the maximum length of UTP cabling between devices

正确答案:B,C

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