Which layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-in security mechanisms?（）

A . 802.1d B . VTP C . 802.1q D . STP E . SAP

A . TFTP B . SMTP C . SNMP D . FTP E . HTTP F . HTTPS

A . OSPF is not supported by the design B . HSRP is not supported by the design C . preempt tuning of the default gateway is needed D . the design implements Layer 3 between the access switch and the distribution switch

A .  Never peer on transit links. B .  Build squares for deterministic convergence. C .  Build inverted U designs for deterministic convergence. D .  Summarize routes at the distribution to the core to limit EIGRP queries or OSPF LSA propagation.

A . Layer 5 B . Layer 4 C . Layer 3 D . Layer 2 E . Layer 1

A . Microsegmentation decreases the number of collisions on the network. B . if a switch receives a frame for an unkown destination，it uses ARP to resolve the address. C . Spanning Tree Protocol allows switches to automatically share vlan information. D . In a properly functioning network with redundant switched paths，each swiched aegment will contain oneroot bridge with all its ports in the forwarding state.All other switches in that broadcast domain will haveonly one root port. E . Establishing vlans increases the number of  broadcast domains. F . Switches that are configured with vlans make forwarding decisions based on both layer 2 and layer 3address information.

A . FTP B . TFTP C . SMTP D . Telnet E . DNS

A . Features such as UplinkFast and BackboneFast are compatible with RSTP. B . An RSTP that is based on Cisco products generally performs better than the Cisco proprietary 802.1D enhancements. C . Cisco proprietary enhancements are not transparent. D . Information about port roles is sent to all switches. E . RSTPs that are based on Cisco products require no additional configuration.

A .  FabricPath provides MAC address scalability with conversational learning B .  Loop mitigation with TTL in the frame field C .  STPl independence D .  10 Gbps bandwidth E .  Layer 2 extensions between data center

A . physical B . network C . transport D . application

A . Hub B . Switch C . Bridge D . NIC E . Transceiver

A . ARP B . HTTPS C . SMTP D . CDP E . TFTP F . ICMP

A . Internet Protocol address B . Media Access Control address C . Packet Layer Proto col address D . Network Service Access Point address E . Authority and Format Identifier addre

A .  when the design implements Layer 2 between the access arid distribution blocks B .  when multiple vendor devices need to be supported C .  when preempt tuning of the default gateway is needed D .  when a robust method of backing up the default gateway is needed E .  when the design implements Layer 2 between the access switch and the distribution blocks F .  when the design implements Layer 2 between the access and distribution block

A . a Frame Relay header includes a 1-bit discard eligible （DE） bit to provide the class of service （CoS） B . an ATM header includes a 1-bit DE field to provide the CoS C . an MPLS EXP field is inserted in the Layer 3 IP precedence field to identify the CoS D . the CoS field only exists inside Ethernet frames when 802.1Q or Inter-Switch Link （ISL） trunking is used E . in the IEEE 802.1p standard， three bits are used to identify the user priority bits for the CoS F . in the IEEE 802.1q standard， six bits are used to identify the user priority bits for the CoS

A . Flex Links B . loop-free U C . looped square D . looped triangle E . loop-free inverted U

A . when HSRP is not supported by the design B . when multiple vendor devices need to be supported C . when preempt tuning of the default gateway is needed D . when a robust method of backing up the default gateway is needed E . when the design implements Layer 2 between the access switch and the distribution switch F . when the design implements Layer 3 between the access switch and the distribution switch

A . Flex Links B . loop-free U C . looped square D . looped triangle E . loop-free inverted U

A . ARP B . RARP C . TCP D . UDP E . IP F . ICMP G . BootP

A . TACACS B . Telnet C . SMTP D . SNMP E . HTTP F . TFTP

A . no switchport trunk native vlan vlan-id B . switchport nonegotiate C . no switchport mode dynamic desirable D . switchport mode acce

A . IGMP B . IGMP snooping C . PIM - DM D . DVMRP E . MOS PF

A . Microsegmentation decreases the number of collisions on the network. B . if a switch receives a frame for an unkown destination,it uses ARP to resolve the address. C . Spanning Tree Protocol allows switches to automatically share vlan information. D . In a properly functioning network with redundant switched paths,each switched aegment will contain one root bridge with all its ports in the forwarding state.All other switches in that broadcast domain will have only one root port. E . Establishing vlans increases the number of broadcast domains. F . Switches that are configured with vlans make forwarding decisions based on both layer 2 and layer 3 address information.

A．ISO B． ANSI C． .CCITT D． IEEE