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多选题In JUNOS Software， which three packet elements can be inspected to determine if asession already exists？（）AIP protocolBIP time-to-liveCsource and destination IP addressDsource and destination MAC addressEsource and destination TCP/UDP port

题目
多选题
In JUNOS Software， which three packet elements can be inspected to determine if asession already exists？（）
A

IP protocol

B

IP time-to-live

C

source and destination IP address

D

source and destination MAC address

E

source and destination TCP/UDP port

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相似问题和答案

第1题：

Firewall filters can be used to accept, discard, or reject packets based on ()

A. protocol type

B. MAC address

C. TCP or UDP port

D. source and destination IP address


参考答案：A, C, D

第2题：

What three pieces of information can be used in an extended access list to filter traffic (Choose three.)()。

A.protocol

B.VLAN number

C.TCP or UDP port numbers

D.source switch port number

E.source IP address and destination IP address

F.source MAC address and destination MAC address


参考答案：A, C, E

第3题：

In JUNOS software with enhanced services, which three packet elements are inspected to determineif a session already exists? ()(Choose three.)

A. IP protocol

B. IP time-to-live

C. source and destination IP address

D. source and destination MAC address

E. source and destination TCP/UDP port


参考答案：A, C, E

第4题：

If an edge Label Switch Router （LSR） is properly configured，which three combinations are possible？（）

  • A、A received IP packet is forwarded based on the IP destination address and the packet is sent as an IP packet.
  • B、An IP destination exists in the IP forwarding table. A received labeled packet is dropped because the label is not found in the LFIB table.
  • C、There is an MPLS label-switched path toward the destination. A received IP packet is dropped because the destination is not found in the IP forwarding table.
  • D、A received IP packet is forwarded based on the IP destination address and the packet is sent as a labeled packet.
  • E、A received labeled IP packet is forwarded based upon both the label and the IP address.
  • F、A received labeled packet is forwarded based on the label. After the label is swapped，the newly labeled packet is sent.

正确答案:A,D,F

第5题：

关于高级访问列表中的destination-port参数，下面描述正确的是（）

  • A、Destination-port是可选参数
  • B、Destination-port用于指定UDP或TCP报文的源端口信息
  • C、仅仅在规则指定的协议号是TCP或者UDP时有效
  • D、如果不指定，表示TCP/UDP报文的任何目的端口信息都匹配

正确答案:A,C,D

第6题：

What does a Layer 2 switch use to decide where to forward a received frame?()

A. source MAC address

B. source IP address

C. source switch port

D. destination IP address

E. destination port address

F. destination MAC address


参考答案：F

第7题：

关于高级访问列表中的destination－port参数,下面描述正确的是()

A.Destination-port是可选参数

B.Destination-port用于指定UDP或TCP报文的源端口信息

C.仅仅在规则指定的协议号是TCP或者UDP时有效

D.如果不指定，表示TCP/UDP报文的任何目的端口信息都匹配


参考答案：A, C, D

第8题：

On which destination port in the Layer 4 header does BGP listen?()

A. UDP port 169

B. TCP port 169

C. UDP port 179

D. TCP port 179


参考答案：D

第9题：

Which of the following descriptions about IP spoofing is correct？（）

  • A、IP source address is forged
  • B、IP destination address is forged
  • C、IP TCP source port is forged
  • D、IP TCP destination port is forged
  • E、None of above

正确答案:A

第10题：

下面能够表示"禁止从129.9.0.0网段中的主机建立与202.38.16.0网段内的主机的WWW端口的连接"的访问控制列表是（）。

  • A、acl101 rule deny tcp source129.9.0.00.0.255.255 destination 202.38.16.00.0.0.255 destination-port equal www
  • B、acl101 rule deny tcp source129.9.0.00.0.255.255 destination 202.38.16.00.0.0.255 destination-port equal 80
  • C、acl100 rule deny udp source129.9.0.00.0.255.255 destination 202.38.16.00.0.0.255 destination-port equal www
  • D、acl99 rule deny udp source129.9.0.00.0.255.255 destination 202.38.16.00.0.0.255 destination-port equal www

正确答案:A,B

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