单选题In BGP MPLS VPNs, which router maintains VPN-specific routing tables, also known as VRFs?（）A PB CEC PED SP
题目
P
CE
PE
SP
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更多“单选题In BGP MPLS VPNs, which router maintains VPN-specific routing tables, also known as VRFs?（）A PB CEC PED SP”相关问题
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第1题：
Open Shortest Path First (OSPF) was designed as an （ ） gateway protocol, for use in an autonomous system such as a local area network (LAN). It implements Dijkstra's algorithm, also known as the （ ） path first algorithm. As a link-state routing protocol it was based on the link-state algorithm developed for the ARPANET in 1980 and the IS-IS routing protocol. OSPF was first standardised in 1989 as RFC 1131, which is now known as OSPF version 1.Routing protocols like OSPF calculate the shortest route to a destination through the network based on an algorithm. The first routing protocol that was widely implemented, the （请作答此空）, calculated the shortest route based on hops, that is the number of routers that an IP packet had to traverse to reach the destination host. RIP successfully implemented dynamic routing, where routing tables change if the network topology changes. But RIP did not adapt its routing according to changing network conditions, such as data-transfer rate. Demand grew for a dynamic routing protocol that could calculate the fastest route to a destination. （ ） was developed so that the shortest path through a network was calculated based on the cost of the route, taking into account bandwidth, delay and load. Therefore OSPF undertakes route cost calculation on the basis of link-cost parameters, which can be weighted by the administrator. OSPF was quickly adopted because it became known for reliably calculating routes through large and complex local area networks.As a link state routing protocol, OSPF maintains link state （ ）, which are really network topology maps, on every router on which it is implemented. The state of a given route in the network is the cost, and OSPF algorithm allows every router to calculate the cost of the routes to any given reachable destination. Unless the administrator has made a configuration, the link cost of a path connected to a router is determined by the bit rate (1 Gbit/s, 10 Gbit/s, etc) of the interface. A router interface with OSPF will then advertise its link cost to neighbouring routers through multicast, known as the hello procedure. All routers with OSPF implementation keep sending hello packets, and thus changes in the cost of their links become known to neighbouring routers. The information about the cost of a link, that is the speed of a point to point connection between two routers, is then cascaded through the network because OSPF routers advertise the information they receive from one neighbouring router to all other neighbouring routers. This process of flooding link state information through the network is known as synchronisation. Based on this information, all routers with OSPF implementation continuously update their link state databases with information about the network topology and adjust their routing tables.OSPF has become a popular dynamic routing protocol. Other commonly used dynamic routing protocols are the RIP and the Border Gateway Protocol (BGP). Today routers support at least one interior gateway protocol to advertise their routing tables within a local area network. Frequently implemented interior gateway protocols besides OSPF are RIP, IS-IS, and the proprietary Interior Gateway Routing Protocol (IGRP) by Cisco.A.OSPF
B.RIP
C.IS-IS
D.EIGRP答案：B解析： -
第2题：
Open Shortest Path First (OSPF) was designed as an （请作答此空） gateway protocol, for use in an autonomous system such as a local area network (LAN). It implements Dijkstra's algorithm, also known as the （ ） path first algorithm. As a link-state routing protocol it was based on the link-state algorithm developed for the ARPANET in 1980 and the IS-IS routing protocol. OSPF was first standardised in 1989 as RFC 1131, which is now known as OSPF version 1.Routing protocols like OSPF calculate the shortest route to a destination through the network based on an algorithm. The first routing protocol that was widely implemented, the （ ）, calculated the shortest route based on hops, that is the number of routers that an IP packet had to traverse to reach the destination host. RIP successfully implemented dynamic routing, where routing tables change if the network topology changes. But RIP did not adapt its routing according to changing network conditions, such as data-transfer rate. Demand grew for a dynamic routing protocol that could calculate the fastest route to a destination. （ ） was developed so that the shortest path through a network was calculated based on the cost of the route, taking into account bandwidth, delay and load. Therefore OSPF undertakes route cost calculation on the basis of link-cost parameters, which can be weighted by the administrator. OSPF was quickly adopted because it became known for reliably calculating routes through large and complex local area networks.As a link state routing protocol, OSPF maintains link state （ ）, which are really network topology maps, on every router on which it is implemented. The state of a given route in the network is the cost, and OSPF algorithm allows every router to calculate the cost of the routes to any given reachable destination. Unless the administrator has made a configuration, the link cost of a path connected to a router is determined by the bit rate (1 Gbit/s, 10 Gbit/s, etc) of the interface. A router interface with OSPF will then advertise its link cost to neighbouring routers through multicast, known as the hello procedure. All routers with OSPF implementation keep sending hello packets, and thus changes in the cost of their links become known to neighbouring routers. The information about the cost of a link, that is the speed of a point to point connection between two routers, is then cascaded through the network because OSPF routers advertise the information they receive from one neighbouring router to all other neighbouring routers. This process of flooding link state information through the network is known as synchronisation. Based on this information, all routers with OSPF implementation continuously update their link state databases with information about the network topology and adjust their routing tables.OSPF has become a popular dynamic routing protocol. Other commonly used dynamic routing protocols are the RIP and the Border Gateway Protocol (BGP). Today routers support at least one interior gateway protocol to advertise their routing tables within a local area network. Frequently implemented interior gateway protocols besides OSPF are RIP, IS-IS, and the proprietary Interior Gateway Routing Protocol (IGRP) by Cisco.A.exterior
B.interior
C.border
D.routing答案：B解析： -
第3题：
When implementing MPLS VPNs between CE and PE routers, which of these statements is correct? As a Network Engineer, it is necessary for you to know how to implement MPLS VPNs between Customer Edge and Provider Edge routers. Refer to the following descriptions, which one is making sense?（）
- A、If using OSPF or EIGRP as the PE-CE routing protocol, redistribution is not required, but any other protocol or static route will require redistribution
- B、If using IS-IS as the PE-CE routing protocol, no redistribution is required
- C、If using static routes between the CE and PE routers, no redistribution of other VPN routes is required
- D、If PE-CE protocol is not BGP, redistribution of other VPN routes from MP-BGP is required
正确答案:D -
第4题：
In BGP routing，what does the rule of synchronization mean？（）
- A、A BGP router can only advertise an EBGP learned route，provided that the route is an IGP route in the routing table.
- B、A BGP router can only advertise an IBGP learned route，provided that the route is an IGP route in the routing table.
- C、A BGP router can only advertise an IBGP learned route，provided that the route is an IGP route that is not in the routing table.
- D、A BGP router can only advertise an EBGP learned route，provided that the route is a metric of 0 in the BGP table.
正确答案:B -
第5题：
When BGP is used as the PE-CE routing protocol, which of these statements is correct?（）
- A、On the CE router, PE neighbors must be configured in the VRF context on the CE router
- B、On PE routers, the CE IBGP neighbors are configured in the global BGP configuration
- C、On PE routers, the CE EBGP neighbors are configured in the VRF context
- D、A separate BGP process must be used on the PE routers for CE routers so that they do not use the same BGP routing process as that used for the PE router's other provider neighbors
正确答案:C -
第6题：
Which two of these are characteristics of MPLS VPNs？ （）
- A、 Layer 3 MPLS VPNs can forward only IP packets
- B、 Layer 2 MPLS VPNs can forward any network protocol
- C、 MPL S label paths are automatically formed based on Layer 2 frames
- D、 Layer 3 MPLS VPNs can forward any network protocol based on Layer 2 frames
- E、 In Layer 2 MPLS VPNS， the service provider controls the customer Layer 3 policies
正确答案:A,B -
第7题：
Which two are advantages of static routing when compared to dynamic routing?（）
- A、Security increases because only the network administrator may change the routing tables.
- B、Configuration complexity decreases as network size increases.
- C、Routing updates are automatically sent to neighbors.
- D、Route summarization iscompued automatically by the router.
- E、Routing traffic load is reduced when used in stub network links.
- F、An efficient algorithm is used to build routing tables,using automatic updates.
- G、Routing tables adapt automatically to topology changes.
正确答案:A,E -
第8题：
In BGP MPLS VPNs, which router maintains VPN-specific routing tables, also known as VRFs?（）
- A、P
- B、CE
- C、PE
- D、SP
正确答案:C -
第9题：
单选题When implementing MPLS VPNs between CE and PE routers, which of these statements is correct? （）AIf using IS-IS as the PE-CE routing protocol, no redistribution is required.
BIf using static routes between the CE and PE routers, no redistribution of other VPN routes is required.
CIf the PE-CE protocol is not BGP, redistribution of other VPN routes from MP-BGP is required.
DIf RIP is the routing protocol that is used between the PE-CE routers, no redistribution is required, but any other protocol will require redistribution.
EIf using OSPF or EIGRP as the PE-CE routing protocol, redistribution is not required, but any other protocol or static route will require redistribution.
正确答案： D解析： 暂无解析 -
第10题：
单选题You have a router running BGP for the MPLS network and OSPF for the local LAN network at the sales office. A route is being learned from the MPLS network that also exists on the OSPF local network. It is important that the router chooses the local LAN route being learned from the downstream switch running OSPF rather than the upstream BGP neighbor. Also， if the local OSPF route goes away， the BGP route needs to be used. What should be configured to make sure that the router will choose the LAN network as the preferred path？（）Astatic route needs to be added
Bfloating static route needs to be added
Cbgp backdoor command
Dospf backdoor command
正确答案： C解析： 暂无解析 -
第11题：
单选题Which statement is true about the forwarding plane?（）AIt uses ASICs for increased performance.
BIt is the intelligence of the platform.
CIt maintains the routing tables.
DIt is based on an x86 architecture.
正确答案： B解析： 暂无解析 -
第12题：
单选题When implementing MPLS VPNs between CE and PE routers, which of these statements is correct? As a Network Engineer, it is necessary for you to know how to implement MPLS VPNs between Customer Edge and Provider Edge routers. Refer to the following descriptions, which one is making sense?（）AIf using OSPF or EIGRP as the PE-CE routing protocol, redistribution is not required, but any other protocol or static route will require redistribution
BIf using IS-IS as the PE-CE routing protocol, no redistribution is required
CIf using static routes between the CE and PE routers, no redistribution of other VPN routes is required
DIf PE-CE protocol is not BGP, redistribution of other VPN routes from MP-BGP is required
正确答案： C解析： 暂无解析 -
第13题：
Open Shortest Path First (OSPF) was designed as an （ ） gateway protocol, for use in an autonomous system such as a local area network (LAN). It implements Dijkstra's algorithm, also known as the （ ） path first algorithm. As a link-state routing protocol it was based on the link-state algorithm developed for the ARPANET in 1980 and the IS-IS routing protocol. OSPF was first standardised in 1989 as RFC 1131, which is now known as OSPF version 1.Routing protocols like OSPF calculate the shortest route to a destination through the network based on an algorithm. The first routing protocol that was widely implemented, the （ ）, calculated the shortest route based on hops, that is the number of routers that an IP packet had to traverse to reach the destination host. RIP successfully implemented dynamic routing, where routing tables change if the network topology changes. But RIP did not adapt its routing according to changing network conditions, such as data-transfer rate. Demand grew for a dynamic routing protocol that could calculate the fastest route to a destination. （请作答此空） was developed so that the shortest path through a network was calculated based on the cost of the route, taking into account bandwidth, delay and load. Therefore OSPF undertakes route cost calculation on the basis of link-cost parameters, which can be weighted by the administrator. OSPF was quickly adopted because it became known for reliably calculating routes through large and complex local area networks.As a link state routing protocol, OSPF maintains link state （ ）, which are really network topology maps, on every router on which it is implemented. The state of a given route in the network is the cost, and OSPF algorithm allows every router to calculate the cost of the routes to any given reachable destination. Unless the administrator has made a configuration, the link cost of a path connected to a router is determined by the bit rate (1 Gbit/s, 10 Gbit/s, etc) of the interface. A router interface with OSPF will then advertise its link cost to neighbouring routers through multicast, known as the hello procedure. All routers with OSPF implementation keep sending hello packets, and thus changes in the cost of their links become known to neighbouring routers. The information about the cost of a link, that is the speed of a point to point connection between two routers, is then cascaded through the network because OSPF routers advertise the information they receive from one neighbouring router to all other neighbouring routers. This process of flooding link state information through the network is known as synchronisation. Based on this information, all routers with OSPF implementation continuously update their link state databases with information about the network topology and adjust their routing tables.OSPF has become a popular dynamic routing protocol. Other commonly used dynamic routing protocols are the RIP and the Border Gateway Protocol (BGP). Today routers support at least one interior gateway protocol to advertise their routing tables within a local area network. Frequently implemented interior gateway protocols besides OSPF are RIP, IS-IS, and the proprietary Interior Gateway Routing Protocol (IGRP) by Cisco.A.RIP
B.IGRP
C.OSPF
D.BGP答案：C解析： -
第14题：
In which two ways does the BGP graceful restart capability preserve prefix information during a restart？（）
- A、The peer router sends an end-of RIB message to the restarting router
- B、The peer router immediately removes the BGP routes that it learned from the restarting router from its BGP routing table
- C、The restarting router does not remove any stale prefixes after the timer for stale entries expires
- D、The router establishes BGP sessions with other routers and relearns the BGP routes from other routers that are also capable of graceful restart. The restarting router waits to receive updates from the neighboring routers. When the neighboring routers send end-of-RIB messages to indicate that they are done sending updates， the restarting router starts sending its own updates
- E、The restarting router removes any stale prefixes after the timer for stale entries expires
正确答案:D,E -
第15题：
MPLS BGP VPN骨干网络中有以下哪种角色的网络设备（）。
- A、P
- B、CE
- C、PE
- D、用户路由器
正确答案:A,C -
第16题：
You have a router running BGP for the MPLS network and OSPF for the local LAN network at the sales office. A route is being learned from the MPLS network that also exists on the OSPF local network. It is important that the router chooses the local LAN route being learned from the downstream switch running OSPF rather than the upstream BGP neighbor. Also， if the local OSPF route goes away， the BGP route needs to be used. What should be configured to make sure that the router will choose the LAN network as the preferred path？（）
- A、static route needs to be added
- B、floating static route needs to be added
- C、bgp backdoor command
- D、ospf backdoor command
正确答案:C -
第17题：
Which two are advantages of static routing when compared to dynamic routing？（）
- A、Security increases because only the network administrator may change the routing tables.
- B、Configuration complexity decreases as network size increases.
- C、Routing updates are automatically sent to neighbors.
- D、Route summarization iscompued automatically by the router.
- E、Routing traffic load is reduced when used in stub network links
- F、An efficient algorithm is used to build routing tables，using automatic updates.
- G、Routing tables adapt automatically to topology changes.
正确答案:A,E -
第18题：
In which two ways does the BGP graceful capability preserve prefix information during a restart？（）
- A、The peer router immediately removes the BGP routers that it learned from the restarting router from itsBGP routing tables.
- B、The router establishes BGP sessions with other routers and relearns the BGP routes from others that are also capable of graceful restart. The restarting router waits to receive updates from the neighboringrouters. When the neighboring routers send end-of-RIB messages to indicate that they are donesending updates，the restarting router starts sending its own updates.
- C、The peer router sends an end-of-RIB message to the restarting router.
- D、The restarting router removes any stale prefixes after the timer for stale entries expires.
- E、The restarting router does not remove any stale prefixes after the timer for stale entries expires.
正确答案:B,D -
第19题：
Which two of these are characteristics of MPLS VPNs?（）
- A、Layer 3 MPLS VPNs can forward only IP packets
- B、Layer 2 MPLS VPNs can forward any network protocol
- C、MPLS label paths are automatically formed based on Layer 2 frames
- D、Layer 3 MPLS VPNs can forward any network protocol based on Layer 2 frames
- E、In Layer 2 MPLS VPNS, the service provider controls the customer Layer 3 policies
正确答案:A,B -
第20题：
Which statement is true about the forwarding plane?（）
- A、It uses ASICs for increased performance.
- B、It is the intelligence of the platform.
- C、It maintains the routing tables.
- D、It is based on an x86 architecture.
正确答案:A -
第21题：
单选题In BGP MPLS VPNs, which router maintains VPN-specific routing tables, also known as VRFs?（）AP
BCE
CPE
DSP
正确答案： A解析： 暂无解析 -
第22题：
单选题When BGP is used as the PE-CE routing protocol, which of these statements is correct?（）AOn the CE router, PE neighbors must be configured in the VRF context on the CE router
BOn PE routers, the CE IBGP neighbors are configured in the global BGP configuration
COn PE routers, the CE EBGP neighbors are configured in the VRF context
DA separate BGP process must be used on the PE routers for CE routers so that they do not use the same BGP routing process as that used for the PE router's other provider neighbors
正确答案： B解析： 暂无解析 -
第23题：
单选题In BGP routing， what does the rule of synchronization mean？（）AA BGP router can only advertise an EBGP learned route， provided that the route is an IGP route in the routing table.
BA BGP router can only advertise an IBGP learned route， provided that the route is an IGP route in the routing table.
CA BGP router can only advertise an IBGP learned route， provided that the route is an IGP route that is not in the routing table.
DA BGP router can only advertise an EBGP learned route， provided that the route is a metric of 0 in the BGP table.
正确答案： B解析： 暂无解析 -
第24题：
多选题In which two ways does the BGP graceful capability preserve prefix information during a restart？（）AThe peer router immediately removes the BGP routers that it learned from the restarting router from itsBGP routing tables.
BThe router establishes BGP sessions with other routers and relearns the BGP routes from others that are also capable of graceful restart. The restarting router waits to receive updates from the neighboringrouters. When the neighboring routers send end-of-RIB messages to indicate that they are donesending updates，the restarting router starts sending its own updates.
CThe peer router sends an end-of-RIB message to the restarting router.
DThe restarting router removes any stale prefixes after the timer for stale entries expires.
EThe restarting router does not remove any stale prefixes after the timer for stale entries expires.
正确答案： B,D解析： 暂无解析