Cisco Express Forwarding (CEF) is mainly used to increase packet switching speed, reducing the overhead and delays introduced by other routing techniques, increasing overall performance.Which of the following concerning CEF is recommended by Cisco?（）A. Use default Layer 4 hash in core.B. Use default Layer 3 hash in distribution.C. Use default Layer 4 hash in distribution.D. Use default Layer 3 hash in core and Layer 3 + Layer 4 hash in distribution layer.
Cisco Express Forwarding (CEF) is mainly used to increase packet switching speed, reducing the overhead and delays introduced by other routing techniques, increasing overall performance.Which of the following concerning CEF is recommended by Cisco?（）
A. Use default Layer 4 hash in core.
B. Use default Layer 3 hash in distribution.
C. Use default Layer 4 hash in distribution.
D. Use default Layer 3 hash in core and Layer 3 + Layer 4 hash in distribution layer.
相关考题：
When is the BA Classifier engaged for identifying the forwarding class of traffic in a Juniper router?() A.after a packet is identified by a multifield classifierB.after the traffic passes though a shaperC.prior to ingress policing of trafficD.while the packet is stored in the switching fabric of the router
Which option correctly identifies the Cisco IOS switching methods in descending order from the fastest method to the slowest method？（）A、CEF， distributed CEF （dCEF）， fast switching， process switchingB、distributed CEF （dCEF）， CEF， fast switching， process switchingC、fast switching， process switching， distributed CEF （dCEF）， CEFD、process switching， fast switching， distributed CEF （dCEF）， CEFE、process switching， distributed CEF （dCEF）， CEF， fast switchingF、process switching， CEF， distributed CEF （dCEF）， fast switching
Which three options are prerequisites to configuring Cisco AutoOoS？（）A、Cisco Express Forwarding （CEF） must be globally enabled.B、Prior to the enabling of the Cisco AutoOoS feature， the bandwidth command must be applied on all interfaces or subinterfaces.C、After the enabling of the Cisco AutoOoS feature， the bandwidth command must be applied on all interfaces or subinterfaces .D、OoS policies must be enabled on all interfaces that will participate in the AutoOoS configuration.E、An IP address must be configured on all low-bandwidth interfaces （768 kb/s or lower） that will participate in the AutoOoS configurationF、An IP address must be configured on all interfaces that will participate in the AutoOoS configuration
Cisco Express Forwarding has been enabled on router TK1. With CEF， prefixes that require exception processing can be cached with one of which four special adjacencies？ （）A、KickB、DropC、ForwardD、NullE、DiscardF、GleanG、Express
Whichof the following are valid modes of packet switching on most routers？（Choose all thatapply.）（）A、Cisco Express FonvardingB、FIB switchingC、Cache switchingD、Optimized switchingE、Process switchingF、Fast switching
Using more than one label on a single packet is required in what context？（）A、MPLS TEB、MPLS VPNC、When CEF switching and Label switching is doneD、In all the above circumstances
Which one of the following potential issues is eliminated by using split horizon？（）A、Joined horizonsB、Packet forwarding loopsC、cisco Express Forwarding load-balancing inconsistencyD、Asymmetric routing throughout the network
Which statement is true about the internal link between the Routing Engine and the Packet-Forwarding Engine?（）A、It is only used for exception traffic.B、It is an FE link called fxp2.C、It is rate-limited to avoid DDOS attacks.D、It is only used to send the forwarding-table from the Routing Engine to the Packet-Forwarding Engine.
Cisco IOS is the software used on the vast majority of Cisco Systems routers and current Cisco network switches. As a network administrator, you are required to configure MPLS on Cisco IOS. In such a situation, which three of the following steps are necessary to take?（）A、Start LDP.B、Enable CEF switching.C、Configure conditional label advertising.D、Enable label switching on frame mode interfaces.E、disable IP TTL propagationF、configure conditional label advertising
Which two statements about the Cisco Nexus 1000V VSM are true?（）A、It performs switching decisions and forwarding for the VEMB、It can be run on a virtual machineC、It can be used for remote VEM switching Iine cards
Which three MPLS statements are true？（）A、Cisco Express Forwarding （CEF） must be enabled as a prerequisite to running MPLS on a Cisco router.B、Frame-mode MPLS inserts a 32-bit label between the Layer 3 and Layer 4 headers.C、MPLS is designed for use with frame-based Layer 2 encapsulation protocols such as Frame Relay， but is not supported by ATM because of ATM fixed-length cells.D、OSPF， EIGRP， IS-IS， RIP， and BGP can be used in the control plane.E、The control plane is responsible for forwarding packets.F、The two major components of MPLS include the control plane and the data plane.
Which of these tables is used by an LSR to perform a forwarding lookup for a packet destined to an address within an RFC 4364 VPN？（）A、CEFB、FIBC、LFIBD、IGP
For best packet switching performance with crypto, what is the recommend packet switching path in a Cisco Teleworker Router?（）A、Process SwitchingB、Silicon Switching C、Cisco Express Forwarding (CEF) SwitchingD、Autonomous Switching
Which of the following is not a characteristic of Cisco Express Forwarding？（）A、The adjacency table is populated from a router’s ARP cacheB、CEF does not require the first packet of a data flow to be process switchedC、CEF maintains the Forward Information Base and the adjacency tableD、CEF can be enabled with the interface command ip cefE、The FIB is populated from a router’s IP routing tableF、On most router platforms CEF is enabled by default
多选题Whichof the following are valid modes of packet switching on most routers？（Choose all thatapply.）（）ACisco Express FonvardingBFIB switchingCCache switchingDOptimized switchingEProcess switchingFFast switching
多选题Which three MPLS statements are true？（）ACisco Express Forwarding （CEF） must be enabled as a prerequisite to running MPLS on a Cisco router.BFrame-mode MPLS inserts a 32-bit label between the Layer 3 and Layer 4 headers.CMPLS is designed for use with frame-based Layer 2 encapsulation protocols such as Frame Relay， but is not supported by ATM because of ATM fixed-length cells.DOSPF， EIGRP， IS-IS， RIP， and BGP can be used in the control plane.EThe control plane is responsible for forwarding packets.FThe two major components of MPLS include the control plane and the data plane.
单选题To increase the distance to the vessel ahead by reducing one’s own speed means（）.Afall backBkeep low speedCrunning afterDdrop back
单选题Which option correctly identifies the Cisco IOS switching methods in descending order from the fastest method to the slowest method？（）ACEF， distributed CEF （dCEF）， fast switching， process switchingBdistributed CEF （dCEF）， CEF， fast switching， process switchingCfast switching， process switching， distributed CEF （dCEF）， CEFDprocess switching， fast switching， distributed CEF （dCEF）， CEFEprocess switching， distributed CEF （dCEF）， CEF， fast switchingFprocess switching， CEF， distributed CEF （dCEF）， fast switching
多选题Cisco IOS is the software used on the vast majority of Cisco Systems routers and current Cisco network switches. As a network administrator, you are required to configure MPLS on Cisco IOS. In such a situation, which three of the following steps are necessary to take?（）AStart LDP.BEnable CEF switching.CConfigure conditional label advertising.DEnable label switching on frame mode interfaces.Edisable IP TTL propagationFconfigure conditional label advertising
单选题Which statement is true about the internal link between the Routing Engine and the Packet-Forwarding Engine？（）AIt is only used for exception traffic.BIt is an FE link called fxp2.CIt is rate-limited to avoid DDOS attacks.DIt is only used to send the forwarding-table from the Routing Engine to the Packet-Forwarding Engine.
多选题Cisco Express Forwarding has been enabled on router TK1. With CEF， prefixes that require exception processing can be cached with one of which four special adjacencies？ （）AKickBDropCForwardDNullEDiscardFGleanGExpress
单选题Cisco Express Forwarding (CEF) is mainly used to increase packet switching speed, reducing the overhead and delays introduced by other routing techniques, increasing overall performance.Which of the following concerning CEF is recommended by Cisco?（）AUse default Layer 4 hash in core.BUse default Layer 3 hash in distribution.CUse default Layer 4 hash in distribution.DUse default Layer 3 hash in core and Layer 3 + Layer 4 hash in distribution layer.
单选题Cisco Express Forwarding （CEF） is mainly used to increase packet switching speed， reducing theoverhead and delays introduced by other routing techniques， increasing overall performance.Which of the following concerning CEF is recommended by Cisco？（）A Use default Layer 4 hash in core.B Use default Layer 3 hash in distribution.C Use default Layer 4 hash in distribution.D Use default Layer 3 hash in core and Layer 3 + Layer 4 hash in distribution layer.
单选题Which of the following is not a characteristic of Cisco Express Forwarding？（）AThe adjacency table is populated from a router’s ARP cacheBCEF does not require the first packet of a data flow to be process switchedCCEF maintains the Forward Information Base and the adjacency tableDCEF can be enabled with the interface command ip cefEThe FIB is populated from a router’s IP routing tableFOn most router platforms CEF is enabled by default
单选题When is the BA Classifier engaged for identifying the forwarding class of traffic in a Juniper router?（）Aafter a packet is identified by a multifield classifierBafter the traffic passes though a shaperCprior to ingress policing of trafficDwhile the packet is stored in the switching fabric of the router
单选题For best packet switching performance with crypto, what is the recommend packet switching path in a Cisco Teleworker Router?（）AProcess SwitchingBSilicon Switching CCisco Express Forwarding (CEF) SwitchingDAutonomous Switching
多选题Which two statements about the Cisco Nexus 1000V VSM are true?（）AIt performs switching decisions and forwarding for the VEMBIt can be run on a virtual machineCIt can be used for remote VEM switching Iine cards
单选题Using more than one label on a single packet is required in what context？（）AMPLS TEBMPLS VPNCWhen CEF switching and Label switching is doneDIn all the above circumstances