The TTL field was originally designed to hold a time stamp, which was decremented by each visited router. The datagram was ( ) when the value became zero. However, for this scheme, all the machines must have synchronized clocks and must know how long it t

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The TTL field was originally designed to hold a time stamp, which was decremented by each visited router. The datagram was ( ) when the value became zero. However, for this scheme, all the machines must have synchronized clocks and must know how long it takes for a datagram to go from one machine to another. Today, this field is used mostly to control the ( ) number of hops (routers) visited by the datagram. When a source host sends the datagram, it ( ) a number in this field. Each router that processes the datagram decrements this number by 1. If this value, after being decremented, is zero, the router discards the datagram.This field is needed because routing tables in the Internet can become corrupted.A datagram may travel between two or more routers for a long time without ever getting delivered to the (请作答此空).This field limits the ( ) of a datagram.

A.switch
B.router
C.source host
D.destination host

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第1题：

The TTL field was originally designed to hold a time stamp, which was decremented by each visited router. The datagram was ( ) when the value became zero. However, for this scheme, all the machines must have synchronized clocks and must know how long it takes for a datagram to go from one machine to another. Today, this field is used mostly to control the ( ) number of hops (routers) visited by the datagram. When a source host sends the datagram, it (请作答此空) a number in this field. Each router that processes the datagram decrements this number by 1. If this value, after being decremented, is zero, the router discards the datagram.This field is needed because routing tables in the Internet can become corrupted.A datagram may travel between two or more routers for a long time without ever getting delivered to the ( ).This field limits the ( ) of a datagram.

A.controls
B.transmits
C.stores
D.receives

答案：C

解析：

TTL的基本概念。

第2题：

When Albert Reynolds became Prime Minister in 1992,both Ireland and Britain agreed to hold regular meetings.（）

Ato deal with the IRA

Bto make preparations for a united Ireland

Cto seek an end to the violence in Northern Ireland

Dto improve relations with each other

C
略

第3题：

A BGP connection is being established.What happens if the local router and the peer router do NOT have the same hold－time value configured?()

A. The BGP session does not establish.

B. The hold time is assumed to be infinite.

C. The larger of the two hold-time values is used.

D. The smaller of the two hold-time values is used.

参考答案：D

第4题：

Which statement correctly describes the disabling of IP TTL propagation in an MPLS network？（）

A、The TTL field from the IP packet is copied into the TTL field of the MPLS label header at the ingress edge LSR
B、TTL propagation cannot be disabled in an MPLS domain
C、TTL propagation is only disabled on the ingress edge LSR
D、The TTL field of the MPLS label header is set to 255
E、The TTL field of the IP packet is set to 0

正确答案:D

第5题：

To provide quality of service （QoS） for voice traffic in an IEEE 802.1 q network， which class of service （CoS） value should be used in the 3-bit， user priority bits （PRI） field？（）

A、The PRI field should contain the Cos value of 010
B、The PRI field should contain the Cos value of 011
C、The PRI field should contain the Cos value of 100
D、The PRI field should contain the Cos value of 101
E、The PRI field should contain the Cos value of 110
F、The PRI field should contain the CoS value of 111

正确答案:D

第6题：

The TTL field was originally designed to hold a time stamp, which was decremented by each visited router. The datagram was ( ) when the value became zero. However, for this scheme, all the machines must have synchronized clocks and must know how long it takes for a datagram to go from one machine to another. Today, this field is used mostly to control the ( ) number of hops (routers) visited by the datagram. When a source host sends the datagram, it ( ) a number in this field. Each router that processes the datagram decrements this number by 1. If this value, after being decremented, is zero, the router discards the datagram.This field is needed because routing tables in the Internet can become corrupted.A datagram may travel between two or more routers for a long time without ever getting delivered to the ( ).This field limits the (请作答此空) of a datagram.

A.lifetime
B.moving time
C.receiving time
D.transmitting time

答案：A

解析：

TTL的基本概念。

第7题：

When Albert Reynolds became Prime Minister in 1992,both Ireland and Britain agreed to hold regular meetings.（）

A、to deal with the IRA
B、to make preparations for a united Ireland
C、to seek an end to the violence in Northern Ireland
D、to improve relations with each other

正确答案:C

第8题：

When debugging a routing problem, the time－to－live (TTL) value can be used to determine:()

A. Number of routes available.

B. Number of router hops.

C. Time that an advertised route is valid.

D. Time to make a round trip.

参考答案：B

第9题：

Which statements concerning the value of a member variable are true， when no explicit assignments have been made？（）

A、The value of an int is undetermined.
B、The value of all numeric types is zero.
C、The compiler may issue an error if the variable is used before it is initialized.
D、The value of a String variable is "" （empty string）.
E、The value of all object variables is null.

正确答案:B,E

第10题：

A user states that the wireless on their laptop was working when they where at home, however,now in the office no wireless connection can be made. Which of the following should the technician check FIRST?（）

A、If the wireless is enabled
B、If the laptop is connected to the correct gateway
C、If the SSID is enabled
D、If the DHCP address scheme is correct

正确答案:A

The TTL field was originally designed to hold a time stamp, which was decremented by each visited router. The datagram was ( ) when the value became zero. However, for this scheme, all the machines m

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