Which three Layer 2 encapsulation types would be used on a WAN rather than a LAN?（）

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• Which three Layer 2 encapsulation types would be used on a WAN rather than a LAN (Choose three.)（）。

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• What can a network administrator utilize by using PPP Layer 2 encapsulation? (Choose three.)（）

  A . VLAN support B . compression C . authentication D . sliding windows E . multilink support F . quality of service

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• The Company is concerned about Layer 2 security threats.  Which statement is true about these  threats？ （）

  A .  MAC spoofing attacks allow an attacking device to receive frames intended for a different  network host. B .  Port scanners are the most effective defense against dynamic ARP inspection. C .  MAC spoofing, in conjunction with ARP snooping, is the most effective counter-measure against reconnaissance attacks that use dynamic ARP inspection (DAI) to determine vulnerable  attack points. D .  Dynamic ARP inspection in conjunction with ARP spoofing can be used to counter DHCP  snooping attacks. E .  DHCP snooping sends unauthorized replies to DHCP queries. F .  ARP spoofing can be used to redirect traffic to counter dynamic ARP inspection. G .  None of the other alternatives apply.

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• Which three statements about classification marking of traffic at Layer 2 are true？ （）

  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

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

  A . Frame Relay B . HDLC C . x.25 D . PPP

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• Which three Layer 2 access designs have all of their uplinks in an active state?（）

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

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• When you design QoS on CE for an MPLS Layer 2 VPN， which three things should be considered？（）

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• Which of the following troubleshooting targets is considered to be a Layer 2 issue？（Choose allthat apply.）（）

  A . Spanning Tree Protocol B . Cabling C . Frame forwarding D . Packet forwarding E . EtherChannel F . Routing protocol

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• Which three Layer 2 access designs have all of their uplinks in an active state？（）

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

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• Which command alone will disable trunking on a Layer 2 switch port？（）

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

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• Which three Layer 2 encapsulation types would be used on a WAN rather than a LAN? (Choose three.)（）

  A . HDLC B . Ethernet C . Token Ring D . PPP E . FDDI F . Frame Relay

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• Which tech nology manages multicast traffic at Layer 2 by configuring Layer 2 LAN interfaces dynamically to forward multicast traffic only to those interfaces that want to receive it?（）

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

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• Which three statements accurately describe layer 2 Ethernet switches?（）

  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.

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