2013 Latest Cisco 350-001 Exam Section 4: Transport (5 Questions)

2013 Latest Cisco 350-001 Exam Section 4: Transport (5 Questions)

In your network, you want the ability to send some traffic around less congested links. To do this, you want to bypass the normal routed hop-by-hop paths. What technology should you implement?
What should you use?

A. Traffic engineering
B. Traffic tunneling
C. Traffic policing
D. Traffic shaping
E. Traffic routing
Answer: A
Traffic engineering allows you to bypass the routing protocol information to send traffic over alternative paths.
Incorrect Answers:
B. Using tunnels will not force the traffic over the tunnels to bypass the normal hop by
hop routed topology.
C, D. Traffic policing and traffic shaping are methods of QoS.

E. Traffic routing is not a well defined Cisco term.

QUESTION NO: 2 Which of the following are found in a basic Network Layer Packet? (Choose all that apply)
A. Network Layer Trailer
B. Upper Layer Data
C. Network Layer Data
D. Network Layer Header
E. Data Link Layer Header
F. Checksum
Answer: A, B, and D
A packet is an information unit whose source and destination are network-layer entities. A packet is composed of the network-layer header (and possibly a trailer) and upper-layer data. The header and trailer contain control information intended for the network-layer entity in the destination system. Data from upper-layer entities is encapsulated in the network-layer header and trailer. The figure illustrates the basic components of a network-layer packet.

The TestKing network is shown in the following exhibit:

Host Testking3 sends a message to host Testking4. Which type of delivery is this?
A. Direct delivery
B. Partial delivery
C. Installment delivery
D. Indirect delivery
E. Instant delivery
F. Guarantee delivery
Answer: A.
Direct delivery implies that both the devices are on the same network segment (IP subnet)
and no router is required for communication between the two.
Incorrect Answers:

D. In indirect delivery the two devices are on different network segments (IP subnets) and a router will be required for the two to communicate.

Real Time Protocol uses which of the following as the transport mechanism?
E. None of the above.
Answer: B
RTP uses UDP for transport.
Incorrect Answers:
A. There is no such thing as RTCP.
C. Since RTP is used for real time traffic, it would not make sense to use TCP for transport, as it provides more overhead that UDP. In addition, the reliable mechanism of TCP is useless for real time traffic such as voice and video traffic, since packets that are resent are too late too late.

QUESTION NO: 5 What should be used to compress Voice over IP packets on a low-speed Frame Relay circuit?
A. TCP header compression
B. FRF.9 payload compression
C. Cisco proprietary payload compression
D. RTP header compression
E. Predictor payload compression
Answer: D
Since VOIP uses the real time protocol (RTP), compressing this type of traffic will be best. RTP is the Internet-standard protocol for the transport of real-time data. It is intended to provide end-to-end network transport functions for applications that support audio, video, or simulation data over multicast or unicast network services. RTP provides support for real-time conferencing of groups of any size within the Internet. This support includes source identification and support for gateways such as audio and video bridges as well as multicast-to-unicast translators. RTP offers QoS feedback from receivers to the multicast group, as well as support for the synchronization of different media streams. RTP includes a data portion and a header portion. The data portion of RTP is a thin protocol that provides support for the real-time properties of applications, such as continuous media, including timing reconstruction, loss detection, and content identification. The header portion of RTP is considerably large. The minimal 12 bytes of the RTP header, combined with 20 bytes of IP header (IPH) and 8 bytes of UDP header, create a 40-byte IP/UDP/RTP header. For compressed-payload audio applications, the RTP packet typically has a 20-byte to 160-byte payload. Given the size of the IP/UDP/RTP header combinations, it is inefficient to transmit the IP/UDP/RTP header without compressing it. To avoid the unnecessary consumption of available bandwidth, the RTP header compression feature-referred to as CRTP-is used on a link-by-link basis. RTP can be used over frame relay, HDLC, and PPP links and is meant to be used over slow links (less that 2 Mbps).
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