Ospf routing protocol typically runs over (72)
A.IP
B.TCP
C.UDP
D.ARP
第1题:
● Serialization delay and (71) delay are the two components of network delay that are improved by increasing bandwidth. Serialization delay, i.e. the amount of time it takes to put the (72) on the wire, and queuing delay (depth of the queue) are improved by increasing the (73) from a 128Kbps circuit to a T1. However, three other components of delay, routing/switching delay, distance delay, and protocol delay are components that can not be positively affected by an (74) in bandwidth. If the circuits are not over-utilized, then increasing the bandwidth to improve the (75) of the application will only result in an increased bandwidth with no positive effects on performance.
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第4题:
●One ofthe main resposibilities ofICMP is to report (71). Although technology has produced increasingly reliable transmission media, errors still exist and must be handled. IP is an (72) protocol. This means that error checking and error control are not a concem ofIP.ICMP was designed, in part, to compensate for this shortcoming. Howerver, ICMP does not _(73) errors, it simply reports them. Error correction is left to the higher-level potocols. Error messages are always sent to the original__(74) because the only information available in the datagram about the route is the source and destination lP addresses. ICMP uses the source IP address to send the error massage to the source ofthe(75) .
(71)
A, numbers
B. functions
C. strings
D. errors
(72)
A. reliable
B. unreliable
C. available
D. unavailable
(73)
A. correct
B. conduct
C. produce
D. connect
(74)
A. user
B. destination
C. source
D. program
(75)
A. datagram
B. frame
C. service
D. protocol
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