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When a packet is sent from Host 1 to Server 1, in how many different frames will the packet be encapsulated as it is sent across the internetwork()。
A.0
B.1
C.2
D.3
E.4
参考答案
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During OSPF adjacency formation, in which state is a router in when an OSPF hello packet has been sent but bi－directional communication has not been achieved?()
A.AB.BC.CD.D
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A PC on a network segment sends data to another PC on a different segment.Which of the following correctly describe the correct order of how this data will be encapsulated?()
A. Data, Frame, Packet, Segment, BitB. Data, Frame, Segment, Packet, BitC. Data, Packet, Frame, Segment, BitD. Data, Packet, Segment, Frame, BitE. Data, Segment, Frame, Packet, BitF. Data, Segment, Packet, Frame, Bit
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Which statement about vlan operation on cisco catalyst switches is true?()
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空白（3）处应选择（）A、sourceB、routeC、destinationD、host
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Which of the following is TRUE about the ping -f command?（）A、 It is useful for diagnosing data dependent problems by filling the packet with the byte pattern following the "f" in the command line. B、 It is useful for flooding from slow character based terminals since it only displays a dot "." for each packet sent in fast mode. C、 It is useful for flooding from slow character based terminals since it only displays a dot "." for each packet sent and a backspace on returned in fast mode. D、 The command can only be run by root.
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Which statement about vlan operation on cisco catalyst switches is true?（）A、when a packet is received from an 802.1Q trunk,the vlan id can be determined from the source MAC address table.B、unkown unicast frames are retransmitted only to the ports that belong to the same vlanC、ports between switches should be configured in access mode so that vlans can span across the portsD、broadcast and multicast frames are retransmitted to ports that are configured on different vlan.
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A PC on a network segment sends data to another PC on a different segment.Which of the following correctly describe the correct order of how this data will be encapsulated?（）A、Data, Frame, Packet, Segment, BitB、Data, Frame, Segment, Packet, BitC、Data, Packet, Frame, Segment, BitD、Data, Packet, Segment, Frame, BitE、Data, Segment, Frame, Packet, BitF、Data, Segment, Packet, Frame, Bit
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When you issue the logging trap informational command, what happens? （）A、An information trap is sent to the SNMP server.B、Informational and debug messages are logged to the syslog server.C、All messages are sent to the logging host, where selections are made.D、All messages from emergencies to informational are sent to the logging host.
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When a packet is sent from Host 1 to Server 1, in how many different frames will the packet be encapsulated as it is sent across the internetwork?（）A、0B、1C、2D、3E、4
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Based on the following output in R1， which statement is true？（）A、If a labeled packet arrives with the top most label of 17， it will be replaced with label 19 and sent out on Ethernet 0/0 interface.B、If a labeled packet arrives with the top most label of 19， it will be replaced with label 17 and sent out on Ethernet 0/0 interface.C、If a labeled packet arrives with the top most label of 17， all the labels will be removed and a clear IP Packet is sent to Next Hop 192.168.0.14 on Ethernet 0/0.D、None of the above.
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When does the E-series router start monitoring DHCP traffic using the DHCP External function?（）A、When the discovery packet enters the router from the DHCP client.B、Only when the offer packet enters the router from the DHCP server.C、When the acknowledge packet enters the router from the DHCP server.D、Only when the discovery packet leaves the router going to the DHCP server.
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单选题When you issue the logging trap informational command, what happens? （）A
An information trap is sent to the SNMP server.B
Informational and debug messages are logged to the syslog server.C
All messages are sent to the logging host, where selections are made.D
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单选题An internet is a combination of networks connected by (1). When a datagram goes from a source to a (2), it will probably pass many (3) until it reaches the router attached to the destination network. A router receives a (4) from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet? The decision is based on optimization: Which of the available (5) is the optimum pathway?
空白（1）处应选择（）A
modemsB
routersC
switcherD
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多选题If an edge Label Switch Router （LSR） is properly configured，which three combinations are possible？（）AA received IP packet is forwarded based on the IP destination address and the packet is sent as an IP packet.BAn IP destination exists in the IP forwarding table. A received labeled packet is dropped because the label is not found in the LFIB table.CThere 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.DA received IP packet is forwarded based on the IP destination address and the packet is sent as a labeled packet.EA received labeled IP packet is forwarded based upon both the label and the IP address.FA received labeled packet is forwarded based on the label. After the label is swapped，the newly labeled packet is sent.
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单选题When using Overlay Transport Virtualization （OTV）， how do L2 multicast frames traverse the overlay？（）A
The L2 multicast frames are encapsulated in an OTV packet using the configured control-group multicast address for transportB
The L2 multicast frames are dropped because multicast cannot be carried across the overlay C
The L2 multicast frames are encapsulated in an OTV packet using the configured data-group multicast address for transportD
The L2 multicast frames are forwarded natively across the overlay based on their multicast IDs
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单选题For (1) service, we need a virtual-circuit subnet. Let us see how that works. The idea behind virtual circuits is to avoid having to choose a new (2) for every packet sent. Instead,when a connection is established, a route from the(3) machine to the destination machine is chosen as part of the connection setup and stored in tables inside the (4) . That route is used for all traffic flowing over the connection, exactly the same way that the telephone system works.When the connection is released, the virtual circuit is also terminated. With connection-oriented service, each packet carries an (5) telling which virtual circuit it belongs to.
空白（1）处应选择（）A
connectionlessB
connection-orientedC
datagramD
telegram
考题
单选题For (1) service, we need a virtual-circuit subnet. Let us see how that works. The idea behind virtual circuits is to avoid having to choose a new (2) for every packet sent. Instead,when a connection is established, a route from the(3) machine to the destination machine is chosen as part of the connection setup and stored in tables inside the (4) . That route is used for all traffic flowing over the connection, exactly the same way that the telephone system works.When the connection is released, the virtual circuit is also terminated. With connection-oriented service, each packet carries an (5) telling which virtual circuit it belongs to.
空白（3）处应选择（）A
sourceB
routeC
destinationD
host
考题
单选题Which of the following is TRUE about the ping -f command?（）A
It is useful for diagnosing data dependent problems by filling the packet with the byte pattern following the f in the command line. B
It is useful for flooding from slow character based terminals since it only displays a dot . for each packet sent in fast mode. C
It is useful for flooding from slow character based terminals since it only displays a dot . for each packet sent and a backspace on returned in fast mode. D
The command can only be run by root.
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单选题Assuming that an IP packet is sent from a source address in VLAN1 to a destination address in VLAN2 through a layer-3 switch, which part of the packet will be changed?（）A
Layer 2 TTLB
Layer 3 TTLC
Layer 3 source addressD
Layer 3 destination address
考题
单选题Which statement about vlan operation on cisco catalyst switches is true?（）A
when a packet is received from an 802.1Q trunk,the vlan id can be determined from the source MAC address tableB
unkown unicast frames are retransmitted only to the ports that belong to the same vlanC
ports between switches should be configured in access mode so that vlans can span across the portsD
broadcast and multicast frames are retransmitted to ports that are configured on different vlan.
考题
单选题Which packet is sent in response to a BGP Open packet?（）A
helloB
keepaliveC
BGP openD
notification
考题
单选题When does the E-series router start monitoring DHCP traffic using the DHCP External function?（）A
When the discovery packet enters the router from the DHCP client.B
Only when the offer packet enters the router from the DHCP server.C
When the acknowledge packet enters the router from the DHCP server.D
Only when the discovery packet leaves the router going to the DHCP server.
考题
单选题A PC on a network segment sends data to another PC on a different segment.Which of the following correctly describe the correct order of how this data will be encapsulated?（）A
Data, Frame, Packet, Segment, BitB
Data, Frame, Segment, Packet, BitC
Data, Packet, Frame, Segment, BitD
Data, Packet, Segment, Frame, BitE
Data, Segment, Frame, Packet, BitF
Data, Segment, Packet, Frame, Bit
考题
单选题Based on the following output in R1， which statement is true？（）A
If a labeled packet arrives with the top most label of 17， it will be replaced with label 19 and sent out on Ethernet 0/0 interface.B
If a labeled packet arrives with the top most label of 19， it will be replaced with label 17 and sent out on Ethernet 0/0 interface.C
If a labeled packet arrives with the top most label of 17， all the labels will be removed and a clear IP Packet is sent to Next Hop 192.168.0.14 on Ethernet 0/0.D
None of the above.
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