Ch 3: Network Management

Guarantees for quality of service are called ________.

SLAs

Using the SNMP Set command ________. A) saves management labor B) requires excellent security C) both A and B D) neither A nor B

both A and B

In SDN, which device manages the control function for individual devices?

SDN controller

Ping tells you ________. A) that a host is reachable B) latency in the connection to the host C) both A and B D) neither A nor B

C) both A and B: that a host is reachable latency in the connection to the host

Traffic shaping may ________ traffic that is undesirable. A) prohibit B) limit C) both A and B D) neither A nor B

C) both A and B: prohibit limit

In SNMP, the manager communicates directly with the managed device.

False

Priority is a way to handle a chronic lack of capacity.

False

The SNMP ________ command changes how managed devices operate.

Set

To handle momentary traffic peaks, which would you give higher priority to?

VoIP

SDN can ________. A) permit routing rules to be changed rapidly B) reduce router costs C) both A and B D) neither A nor B

both A and B

In SDN, applications ________.

are required to make SDN work effectively

SNMP Get commands can ________.

ask agents for information about the managed device

Transmission speed is normally measured in ________.

bits per second

ISPs usually offer QoS guarantees to ________.

business customers

SNMP Set commands can ________.

change router operation

Creating routing tables is an example of ________.

control

Creating switching tables is an example of ________.

control

SDN holds the promise of bringing ________.

lower cost

To determine if a host is reachable, you send a(n) ________.

ping

Which of the following usually has higher availability?

public switched telephone network (PSTN)

In QoS, the S stands for ________.

service

In SDN, a switch receives its forwarding table rules directly from ________.

the SDN controller

An SLA specifies the ________.

worst case

Which of the following tells you the cumulative round-trip latency to each router along the route to the host?

Traceroute

SNMP network management ________.

decreases total cost

When a packet travels through a network, the time it takes to get from the sender to the receiver is called ________.

latency

The SNMP manager stores the information it receives from Get commands ________.

in the MIB

In a coffee shop hot spot, the rated speed is 10 Mbps. Throughput is about half of the rated speed. There are ten people using the hot spot. If you and three others are transmitting or receiving at the same time, what speed should you expect to get?

1.25 Mbps

If you have 10 sites connected by 7 transmission links, how many rows of traffic data will you have in your traffic table?

10

In a coffee shop, there are ten people sharing an access point with a rated speed of 2Gbps. The throughput is half the rated speed. If each person downloading is getting an average of 200Mbps, how many people are using the Internet at that moment?

5

If you have 10 sites connected by 7 transmission links, how many columns will you have in your traffic table?

7

________ is the percentage of time that a network is available for use.

Availability

Momentary traffic peaks can lead to ________.

BOTH latency and packet loss

Which of the following reduces momentary traffic peaks by controlling how much traffic is allowed into the network? A) overprovisioning B) priority C) QoS guarantees D) none of the above

D) none of the above

Variability in delay is called ________.

Jitter

Routers and switches must support ________.

Southbound APIs

The damage of momentary traffic peaks can be addressed by ________. A) using priority B) adding more capacity C) both A and B D) neither A nor B

both A and B: A) using priority B) adding more capacity

Jitter is a problem for ________.

both voice over IP (VoIP) and streaming media

Routing packets is an example of ________.

forwarding

Error rates can soar when the network traffic level is at a(n) ________.

high level

________ can be addressed by using priority.

Momentary traffic peaks

Users of an access point share the transmission capacity of the access point. The throughput a user gets is called the ________.

individual throughput

The business benefit of multiplexing is ________.

lower cost

Compared to priority, overprovisioning capacity can reduce ________.

management labor

An SLA specifies ________.

maximum jitter

An SLA specifies ________.

maximum latency

If throughput falls substantially below a QoS guaranteed speed, the ISP ________.

may pay a penalty

QoS is quantified through ________.

metrics

Latency is usually measured in ________.

milliseconds (ms)

An SLA specifies ________.

minimum availability

An SLA specifies ________.

minimum speed

Trunk lines in the Internet core are ________.

multiplexed

Jitter is a problem for ________. A) downloading a file attached to an e-mail B) e-mail C) both A and B D) neither A nor B

neither A nor B

SNMP agents communicate with the ________.

network management program

Which of the following is NOT governed by the SNMP standard?

network visibility program

Communication between SDN applications and SDN controllers is governed by ________.

northbound APIs

Ping tells you ________.

round-trip latency

Using standard configurations ________.

saves money

Momentary traffic peaks usually last a few ________ or less.

seconds

Communication between SDN controllers and routers is governed by ________.

southbound APIs

Adding applications that cannot tolerate jitter may require ________.

switch upgrades

For analysis, network administrators usually interact primarily with ________.

the network visualization program

Throughput is ________.

the speed a network actually provides to users

Control is done on individual switches and routers in ________.

traditional operation

Forwarding functions are located in routers in ________.

traditional operation

SNMP agents can initiate ________.

traps