Network Exam Chapter 9

LFI
Identify the quality of service (QoS) mechanism that can fragment large packets and interleave smaller packets in amongst the packet fragments.
150 ms

Network performance requirements for voice include no more than 150 ms of one-way delay, no more than 30 ms of jitter, and no more than 1 percent packet loss

What is an acceptable one-way latency in a typical VoIP network?
Marking
Identify the quality of service (QoS) function that alters bits in a frame, cell, or packet.
RED
Identify the congestion-avoidance mechanism from the following list of QoS tools.
Serialization delay
What type of delay is the amount of time required for a packet to exit a router’s serial interface?
192.168.5.64/26

Four subnets are supported with two borrowed bits, based on the formula: number of subnets = 2̂s, where s is the number of borrowed bits (that is, 2̂2 = 4). Since a design requirement stated that the number of hosts per subnet be maximized, you would not want to use more borrowed bits than necessary. Therefore, you should choose a 26-bit subnet mask (that is, 255.255.255.192).

The block size is 64 (that is, 256 – 192 = 64). Therefore, the subnets created by subnetting the 192.168.5.0/24 network with a 26-bit subnet mask are:
192.168.5.0/26
192.168.5.64/26
192.168.5.128/26
192.168.5.192/26

You are designing a small office/home office (SOHO) network, and you wish to have four subnets, while maximizing the number of hosts per subnet. The network you need to subnet is 192.168.5.0/24. Which of the following is one of the four subnets you should create?
LACP
What technology permits the bundling of links together to increase bandwidth and redundancy?
Content Engine
What performance optimization technology uses a network appliance, which can receive a copy of content stored elsewhere (for example, a video presentation located on a server at a corporate headquarters), and serves that content to local clients, thus reducing the bandwidth burden on an IP WAN?
Policing
Identify the quality of service (QoS) mechanism that can set a bandwidth limit on traffic and drop packets attempting to exceed that bandwidth limit.
Traffic Shaping
If you want to buffer excess traffic and send it later, what traffic conditioning technology should you consider?
Traffic Shaping
Identify the quality of service (QoS) mechanism that can set a bandwidth limit on traffic and delays packets, rather than drops packets, attempting to exceed that bandwidth limit.
RTP (Real-time Transport Protocol)
Which of the following protocols is most latency sensitive?
Congestion Management
Queuing is another name for which of the following quality of service (QoS) functions?
Active-standby
What mode of NIC redundancy uses has only one NIC active at a time?
Packet Drops

Delay

Jitter

A lack of bandwidth can lead to which QoS issues?
Attenuation
What term refers to the weakening of a signal as it travels in the network?
Bc
Which traffic-shaping parameter is a measure of the number of bits or bytes transmitted during a timing interval?
CARP

Hot Standby Router Protocol (HSRP) is a Cisco-proprietary approach to first-hop (that is, Layer 3) redundancy. Common Address Redundancy Protocol (CARP) is an open standard variant of HSRP.

Differentiated Services Code Point (DSCP) is a Layer 3 Quality of Service (QoS) marking.

Link Fragmentation and Interleaving (LFI) is a QoS link efficiency mechanism.

RTP Header Compression (cRTP) is a QoS link efficiency mechanism.

Which of the following is an open standard variant of HSRP?
Approximately five minutes

A network that has “five nines” of availability is up and operational 99.999 percent of the time. This equates to a maximum yearly downtime of approximately five minutes.

A network that has “six nines” of availability is up and operational 99.9999 percent of the time. This equates to a maximum yearly downtime of approximately 30 seconds.

A network that has “four nines” of availability is up and operational 99.99 percent of the time. This equates to a maximum yearly downtime of approximately 50 minutes.

A network that has “three nines” of availability is up and operational 99.9 percent of the time. This equates to a maximum yearly downtime of approximately nine hours

If a network has “five nines” of availability, what is its maximum downtime per year?
LFI

CBWFQ is congestion management, WRED is congestion avoidance, and traffic shaping is considered policing and shaping.

Which of the following mechanisms is considered a link-efficiency tool in QoS?