TCP、IP试题3
1.ICMP is a _________ layer protocol.
A.data link
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2.ICMP messages are divided into two broad categories
A.query and error reporting messages
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3.An ICMP message has _____ header and a variable-size data section.
A.32 bytes
B.16 bytes
C.8 bytes
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4.Which of the following is true about ICMP messages?
A.An ICMP error message may be generated for an ICMP error message.
B.An ICMP error message may be generated for each fragment
C.An ICMP error message may be generated for a multicast datagram
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5.Which of the following is true about ICMP messages?
A.An ICMP error message may be generated for an ICMP error message.
B.An ICMP error message may be generated only for the first fragment.
C.An ICMP error message may be generated for a multicast datagram.
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6.Which of the following is true about ICMP messages?
A.An ICMP error message may be generated for an ICMP error message.
B.An ICMP error message may be generated only for each fragment.
C.No ICMP error message will be generated for a datagram having a special address such as 127.0.0.0 or 0.0.0.0.
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7.If a host needs to synchronize its clock with another host, it sends a _______ message.
A.timestamp-request
B.source-quench
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8.In error reporting the encapsulated ICMP packet goes to _______.
A.the original sender
B. a router
C.the receiver
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9.What field uniquely identifies the kind of ICMP message (for example, echo reply versus echo request)?
C.option ID
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10.When the hop-count field reaches zero and the destination has not been reached, a _______ error message is sent.
A.destination-unreachable
B.time-exceeded
C.parameter-problem
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11.When all fragments of a message have not been received within the designated amount of time,
a _______ error message is sent.
A.source-quench
B.time-exceeded
C.parameter-problem
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12.Errors in the header or option fields of an IP datagram require a _______ error message..
A.parameter-problem
B.source-quench
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13. A _______ can learn about network _______ by sending out a router-solicitation packet.
C.host, routers
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14.Who can send ICMP error-reporting messages?
B.destination hosts
C.both a and b
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15.One method to alert a source host of congestion is the _______ message.
C.source-quench
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16. A time-exceeded message is generated if _______.
A.the round-trip time between hosts is close to zero
B.fragments of a message do not arrive within a set time
C.both a and b
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17.In calculating the time difference between two clocks, a negative value indicates _______.
A.an invalid calculation
B.the source clock lags behind the destination clock
C.the destination clock lags behind the source clock
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18.An IP datagram (datagram A) cannot reach its destination. An ICMP error message is sent to
the source. The data field of the IP datagram (datagram B) that encapsulates the ICMP packet contains _______.
B.the ICMP header plus 8 bytes of datagram A
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