Which statement best describes the application of link fragmentation and interleaving （LFI）？（）A、It compresses the Layer 2 payload and marks the packet as a high priority to be transmitted firstB、It fragments larger packets and allows VoIP packets to be tr

第1题：

第2题：

Which statement best describes echo?（）

• A、Echo is the discernable leak-through of your own Rx path into your own Tx path. 
• B、Echo is the discernable leak-through of the packets of your Rx path into your own Tx path. 
• C、Echo is the nonaudible leak-through of the packets of your Rx path into your own Tx path. 
• D、Echo is the audible leak-through of the packets from the transmit path into your own receive path. 
• E、Echo is the nonaudible leak-through of the packets of your Tx path into your own Rx path.

第3题：

What are two ways to minimize the delay of VoIP packets that are traversing a network？（）

• A、Use WFQ， CBWFO， and LLO to prioritize delay-sensitive packets
• B、Use WFO， CBWFO， and LLO to compress the payload.
• C、Give TCP packets priority over UDP packets.
• D、Use control plane policing for cRTP queuing.
• E、Use stacker and predictor to compress the payload.

第4题：

Which of these tools should you use to compress VoIP packets on a low-speed Frame Replay circuit?（）

• A、Cisco Proprietary payload compression
• B、Predictor payload compression
• C、RTP header compression
• D、TCP header compression

第5题：

VOIP is being implemented in the Company network and you need to assess the need for QoS.   Which of the following network problems would indicate a need to implement QoS features？（）

• A、Mis-routed packets  
• B、Excess jitter
• C、Delay of critical traffic
• D、Packet loss due to congestion
• E、Data link layer broadcast storms
• F、FTP connections unsuccessful

第6题：

Which statement about OSPF authentication is true？（）

• A、To enable OSPF authentication in a network， OSPF area 0 authentications must be enabled first
• B、The payload of OSPF version 3 packets contains no authentication information
• C、OSPF version 3 supports Advanced Encryption Standard
• D、OSPF version 3 uses router ID as a key to encrypt OSPF hello packets
• E、OSPF MD5 authentication uses TCP， and Plan Test authentication uses UDP

第7题：

VOIP has been implemented at the main office of the Company network. Which two statements  are true about voice packets in a LAN？（）

• A、 Voice carrier stream utilizes Real-Time Transport Protocol (RTP) to carry the audio/media  portion of the VoIP communication.  
• B、 Voice traffic data flow involves large volumes of large packets.  
• C、 Because a packet loss involves a small amount of data, voice traffic is less affected by packet  losses than traditional data traffic is.  
• D、 Voice packets are encapsulated in TCP segments to allow for proper sequencing during  delivery. 
• E、 Voice packets are very sensitive to delay and jitter. 

第8题：

Which statement is true about IP telephony calls？（）

• A、 A Voice over IP （VoIP） packet consists of the voice payload， IP header， TCP header， RTP header， and  Layer 2 link header.
• B、 The voice carrier stream uses H323 to set up， maintain， and tear down call endpoints.
• C、 Call control signaling uses Real-Time Transport Protocol （RTP） packets that contain actual voice  samples.
• D、 The sum of bandwidth necessary for each major application， including voice， video， and data， should not exceed 75 percent of the total available bandwidth for each link.

第9题：

What are two ways to minimize the delay of VoIP packets that are traversing a network？ （）

• A、 Use WFQ， CBWFQ， and LLQ to prioritize delay-sensitive packets.
• B、 Use WFQ， CBWFQ， and LLQ to compress the payload.
• C、 Give TCP packets priority over UDP packets.
• D、 Use control plane policing for cRTP queuing.
• E、 Use stacker and predictor to compress the payload.

第10题：

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第12题：

第13题：

Which two statements are true about MLP interleaving？ （）

• A、 It fragments and encapsulates all packets in a fragmentation header.
• B、 Packets smaller than the fragmentation size are interleaved between the fragments of thelarger packets.
• C、 Packets larger than the fragmentation size are always fragmented， and cannot be interleaved，even if the traffic is voice traffic.
• D、 It fragments and encapsulates packets that are longer than a configured size， but does not encapsulate smaller packets inside a fragmentation header.

第14题：

Refer to the exhibit. A router has a 256 kbps Frame Relay circuit connected to interface serial 0/0. As a large FTP packet is being placed into the hardware transmit queue of interface serial 0/0， a voice packet is placed into the priority queue of that interface. How， and in what order， wi the packets be transmitted？（）

• A、the voice packet will be transmitted first， followed by the FTP packet in its entirety
• B、the voice packet will be transmitted first， followed by the fragmented FTP packet
• C、the FTP packet will be fragmented and the voice packet will be interleaved
• D、the FTP packet will be transmitted first in its entirety， follow by the voice packet

第15题：

Which two statements are true about Voice over IP （VoIP） packet delivery in a digital infrastructure？ （）

• A、 Packets can arrive out of order.
• B、 Packets must take the same path to the destination.
• C、 Once packets are received at the destination router， the router performs sampling to ensure the quality of the voice traffic.
• D、 Packets can experience varying delays across the network.
• E、 Packets containing voice samples are sequentially numbered by default， allowing for reordering upon arrival at the terminal router along the path.

第16题：

Which of the following correctly describe steps in the OSI data encapsulation process?（）

• A、Transport layer divides a data stream into segments & adds reliability & flow control information
• B、Data link layer adds physical source & destination address & an FCS to the segment
• C、Packets are created when the network layer encapsulate a frame with source & destination host address& protocol related control information
• D、Packets are created when the network layers adds layers 3 address & control information to a segment
• E、The presentation layer translated bits into bits into voltages for transmission across the physical link

第17题：

In the design of a QoS solution， which two factors should be taken into consideration？（）

• A、 On congested links， all forms of traffic will require some form of QoS.
• B、 All traffic types and requirements should be examined to determine the number of traffic classes required.
• C、 In the implementation of link efficiency mechanisms on links that typically transport relatively large packets， header compression will be most efficient.
• D、 In the implementation of link efficiency mechanisms on links that typically transport relatively small packets， header compression will be most efficient.
• E、 In the implementation of link efficiency mechanisms on links that typically transport relatively small packets， payload compression will be most efficient.
• F、 Payload compression provides more available bandwidth and reduces processing delay time.

第18题：

A user opens a webpage that requires the transmission of packets from the Web server to the client's browser. The packets transmitted from the Web server to the client exceed the smallest MTU value on the communications path. Which two protocol functions allow this type of communication?（）

• A、packet segmentation
• B、serialized checking
• C、packet sequencing
• D、parallel checking

第19题：

Which layer in the TCP/IP model is responsible for delivering packets to their destination?（）

• A、Application Layer
• B、Transport Layer
• C、Internet Layer
• D、Network Access Layer

第20题：

In Any Transport over MPLS （AtoM） Control word is an optional 4-byte field used in the pseudowire packet.The control word carries generic and Layer 2 payload-specific information to emulate L2 packets correctly.In pseudowire packet， where is this Control Word inserted？（）

• A、Inserted between the MPLS label stack and the Layer 3 payload
• B、Inserted between the MPLS label stack and the Layer 3 Header
• C、Inserted between the MPLS label stack and the Layer 2 payload
• D、Inserted between the MPLS label stack and the Layer 2 header

第21题：

A small amount of spoofed packets are being sent across a network and a large amount of reply packets are being sent back to the network resource. Which of the following BEST describes this security threat?（）

• A、Worm
• B、Smurf
• C、Logic Bomb
• D、Man-in-the-middle

第22题：

第23题：