单选题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.
题目
Number of routes available.
Number of router hops.
Time that an advertised route is valid.
Time to make a round trip.
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更多“单选题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.”相关问题
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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 ( ) 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答案：D解析：TTL的基本概念。 -
第2题：
How does route poisoning work with holddown timers to prevent routing loops?（）
- A、Information learned from one source is not distributed back to that source.
- B、Routing updates from the poisoned source are ignored until a holddown timer expires.
- C、Failed routes are advertised with infinite metrics.
- D、New routing updates are ignored until the network has converged.
- E、A route is marked as unavailable when its time-to-live is exceeded.
正确答案:C -
第3题：
When EIGRP is used as the PE-CE routing protocol which of these statements is correct?（）
- A、EIGRP can be used only as the PE-CE routing protocol if the PE and CE routers are in the same AS
- B、Other EIGRP AS routes are automatically advertised to the CE router and do not require a redistribution configuration command to be configured
- C、Unlike other routing protocols that are used between PE and CE routers, EIGRP supports backdoor links
- D、Configure of the VPN is only required on the PE router
正确答案:D -
第4题：
A router has been configured with an EIGRP variance of 3. Which of the following statements istrue？（）
- A、An error will result because a router cannot be configured with an EIGRP variance of 3 becausethe maximum variance number is 2
- B、The successor route will end up in the routing table， and so will any route with a metric at mostthree times greater than the value of the successor’s metric
- C、EIGRP will only advertise routes that are within three hops of the current router
- D、The successor route will end up in the routing table， and so will any route with a metric at leastone third the value of the successor’s metric
- E、The best three routes with equal cost paths will end up in the routing table
- F、The successor route will be any route with three times the value of the advertised distance
正确答案:B -
第5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.
正确答案:B -
第6题：
What is the role of route preference?（）
- A、It is used to determine which route should become active.
- B、It is used to select which routing table to use for forwarding.
- C、It is used to determine what routes to accept into the routing table.
- D、It is used to select the best route between multiple equal cost paths.
正确答案:A -
第7题：
What are two valid match criteria for a routing policy? （）
- A、OSPF are a ID
- B、prefix list
- C、port
- D、time-to-live（TTL）
正确答案:A,C -
第8题：
You executed the following query in your database： FROM V$FLASHBACK_DATABASE_LOG; What would you determine from the output？（）
- A、the time when the last flashback operation in your database was performed
- B、the time when the first flashback operation in your database was performed
- C、a list of flashback operations performed in your database using SCN and time
- D、the approximate time and the lowest system change number （SCN） to which you can flash back your database
正确答案:D -
第9题：
单选题When debugging a routing problem, the time-to-live (TTL) value can be used to determine:（）ANumber of routes available.
BNumber of router hops.
CTime that an advertised route is valid.
DTime to make a round trip.
正确答案： C解析： 暂无解析 -
第10题：
单选题What is the role of route preference?（）AIt is used as a tie breaker when the same prefix is available through multiple sources
BIt is used to determine which routes to accept into the routing table
CIt is used to select the best route between multiple equal-cost paths
DIt is used to select which routing table to use for forwarding
正确答案： D解析： 暂无解析 -
第11题：
单选题A router has been configured with an EIGRP variance of 3. Which of the following statements istrue？（）AAn error will result because a router cannot be configured with an EIGRP variance of 3 becausethe maximum variance number is 2
BThe successor route will end up in the routing table， and so will any route with a metric at mostthree times greater than the value of the successor’s metric
CEIGRP will only advertise routes that are within three hops of the current router
DThe successor route will end up in the routing table， and so will any route with a metric at leastone third the value of the successor’s metric
EThe best three routes with equal cost paths will end up in the routing table
FThe successor route will be any route with three times the value of the advertised distance
正确答案： B解析： 暂无解析 -
第12题：
单选题How does route poisoning work with holddown timers to prevent routing loops?（）AInformation learned from one source is not distributed back to that source.
BRouting updates from the poisoned source are ignored until a holddown timer expires.
CFailed routes are advertised with infinite metrics.
DNew routing updates are ignored until the network has converged.
EA route is marked as unavailable when its time-to-live is exceeded.
正确答案： D解析： 暂无解析 -
第13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14题：
What is the first step that you would use Cisco Product Advisor for when selecting a router for an Edge solution？（）
- A、 determine types of protocols to be supported
- B、 determine the environment in which the router will be used
- C、 select the number of WAN ports required
- D、 select the number of LAN ports required
正确答案:B -
第15题：
What are two valid match criteria for a routing policy?（）
- A、OSPF area ID
- B、prefix list
- C、port
- D、time-to-live (TTL)
正确答案:A,B -
第16题：
While troubleshooting an EIGRP routing problem you notice that one of the company routers havegenerated a large number of SIA messages. What are two possible causes for EIGRP Stuck-In-Active routes？（）
- A、Some query or reply packets are lost between the routers
- B、The neighboring router starts receiving route updates from this router
- C、A failure causes traffic on a link between two neighboring routers to flow in only one direction（unidirectional link）
- D、The neighboring router stops receiving ACK packets from this router
正确答案:A,C -
第17题：
Which two statements are correct about routing tables in JUNOS?（）
- A、There are separate tables for IPv4 and IPv6 called inet.0 and inet6.0 respectively.
- B、They only contain the best possible route to each destination.
- C、All running protocols can populate the routing tables at the same time.
- D、Routes with the highest preference value are placed as active routes in the routing table.
正确答案:A,C -
第18题：
What is the role of route preference?（）
- A、It is used as a tie breaker when the same prefix is available through multiple sources
- B、It is used to determine which routes to accept into the routing table
- C、It is used to select the best route between multiple equal-cost paths
- D、It is used to select which routing table to use for forwarding
正确答案:A -
第19题：
You executed the following query in your database： SELECT oldest_flashback_scn， oldest_flashback_time FROM V$FLASHBACK_DATABASE_LOG； What would you determine from the output？（）
- A、 The time when the last flashback operation in your database was performed.
- B、 The time when the first flashback operation in your database was performed.
- C、 A list of flashback operations performed in your database using SCN and time.
- D、 The approximate time and the lowest system change number （SCN） to which you can flash back your database.
正确答案:D -
第20题：
单选题What is the role of route preference?（）AIt is used to determine which route should become active.
BIt is used to select which routing table to use for forwarding.
CIt is used to determine what routes to accept into the routing table.
DIt is used to select the best route between multiple equal cost paths.
正确答案： B解析： 暂无解析 -
第21题：
单选题You executed the following query in your database： FROM V$FLASHBACK_DATABASE_LOG; What would you determine from the output？（）Athe time when the last flashback operation in your database was performed
Bthe time when the first flashback operation in your database was performed
Ca list of flashback operations performed in your database using SCN and time
Dthe approximate time and the lowest system change number （SCN） to which you can flash back your database
正确答案： D解析： 暂无解析 -
第22题：
单选题When EIGRP is used as the PE-CE routing protocol which of these statements is correct?（）AEIGRP can be used only as the PE-CE routing protocol if the PE and CE routers are in the same AS
BOther EIGRP AS routes are automatically advertised to the CE router and do not require a redistribution configuration command to be configured
CUnlike other routing protocols that are used between PE and CE routers, EIGRP supports backdoor links
DConfigure of the VPN is only required on the PE router
正确答案： C解析： 暂无解析 -
第23题：
单选题You executed the following query in your database： SELECT oldest_flashback_scn， oldest_flashback_time FROM V$FLASHBACK_DATABASE_LOG； What would you determine from the output？（）AThe time when the last flashback operation in your database was performed.
BThe time when the first flashback operation in your database was performed.
CA list of flashback operations performed in your database using SCN and time.
DThe approximate time and the lowest system change number （SCN） to which you can flash back your database.
正确答案： D解析： 暂无解析 -
第24题：
单选题What is the first step that you would use Cisco Product Advisor for when selecting a router for an Edge solution？（）Adetermine types of protocols to be supported
Bdetermine the environment in which the router will be used
Cselect the number of WAN ports required
Dselect the number of LAN ports required
正确答案： D解析： 暂无解析