SONET’s three layers are（）.

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

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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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• SONET Path Terminating Equipment (PTE) requires which three line codes to be supported for DS1 and DS3 circuits?（） (Choose three.)

  A . AMI B . ESF C . DUS D . SSM E . B3ZS F . B8ZS

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• What are two characteristics of dual-ring interconnect in SONET networks? （）(Choose two.)

  A . It protects signals against node failures between rings. B . It protects signals against node failure within a single ring. C . It allows for traffic to be preempted when a ring switch occurs. D . Traffic can be dropped and continued at interconnecting nodes. E . It protects preemptible traffic from being dropped when a ring switch occurs.

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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 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.

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• SONET Code Violations (CVs) totals in the PM tables are actually an accumulation of the number of （）.

  A . J0 errors detected in a specified interval B . errors detected in a given Errored Second (ES) C . errors detected in a given Severely Errored Second (SES) D . errors the encryption algorithm detects in a specified interval E . Bit Interleaved Parity (BIP) errors detected in a specified interval

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• Which three of the following OSI model layers also belong to the TCP/IP model?（）

  A . The application layer B . The session layer C . The data link layer D . The transport layer E . The network interface layer F . The physical layer

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• Which three are advantages of SONET？（）

  A . Allows the transportation of all forms of traffic B . Multiplexing is easy C . Clocks do not need to be synchronized D . Reduces network complexity and cost E . Padding is not necessary and not permitted

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• Which three of the protocols below belong to the application layer?（）

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

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• The Company network utilizes the Multiple-instance Spanning Tree protocol in its switched LAN.   Which three statements about the MST protocol （IEEE 802.1S） are true？ （）

  A .  To verify the MST configuration， the show pending command can be used in MST configuration  mode. B .  When RSTP and MSTP are configured； UplinkFast and BackboneFast must also be enabled. C .  All switches in the same MST region must have the same VLAN-to-instance mapping， but  different configuration revision numbers. D .  All switches in an MST region， except distribution layer switches， should have their priority  lowered from the default value 32768. E .  An MST region is a group of MST switches that appear as a single virtual bridge to adjacent  CST and MST regions. F .  Enabling MST with the "spanning-tree modemst" global configuration command also enables  RSTP.

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

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

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• As an experienced technician, you are responsible for Technical Support in your company. You ask one of the trainees to document the layers of an existing CIS network. Which three statements best characterize this process? （）(Choose three.)

  A . It provides reliable input for verifying network consistency. B . It requires a network audit to support some upgrade decisions. C . It requires a network audit to support any network restructuring. D . It begins with gathering organizational input that may be inaccurate.

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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 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 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 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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