Question

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Quiz

Question 1 (1 point)

Saved

What metric is used to measure bandwidth?

Question 1 options:

	a. msec
	b. bit/sec
	c. bytes
	d. number of packets/sec

Question 2 (1 point)

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Ethernet is one of access network technologies.

Question 2 options:

	True
	False

Question 3 (1 point)

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Consider two hosts, A and B, connected by a single link of rate R bps. Suppose that the two hosts are separated by m meters, and suppose the propagation speed along the link is s meter/sec. Host A is to send a packet of size L bits to Host B. What is the transmission delay?

Question 3 options:

	a. m/s
	b. L/R
	c. m/s + L/R
	d. 2 * (m/s + L/R)

Question 4 (1 point)

Saved

What is the DSL downstream transmission rate defined in the ITU DSL standards?

Question 4 options:

	d. 1.2 Gbps
	b. 12 Mbps
	c. 120 Mbps
	a. 1.2 Mbps

Question 5 (1 point)

Saved

In the packet delay model in packet-switched networks, what delay source depends on congestion level?

Question 5 options:

	a. processing delay
	b. queuing delay
	c. transmission delay
	d. propagation delay

Question 6 (1 point)

Saved

What multiplexing technique is used to implement a circuit in a link (for circuit switching)?

Question 6 options:

	a. FDM
	b. TDM
	c. Either FDM or TDM
	d. CSMA/CD

Question 7 (1 point)

Saved

With packet switching, there can be excessive congestion causing packet delay and loss.

Question 7 options:

	True
	False

Question 8 (1 point)

Saved

What is the Ethernet transmission rate?

Question 8 options:

	a. 10 Mbps
	b. 100 Mbps
	c. 1 Gbps
	d. Variable from 10 Mbps to 10 Gbps

Question 9 (1 point)

Saved

Consider link capacities of N links {R1, ..., RN} for two end systems. What is the definition of bottleneck link?

Question 9 options:

	a. min(R1, ..., RN)
	b. max(R1, ..., RN)
	c. mean(R1, ..., RN)
	d. median(R1, ..., RN)

Question 10 (1 point)

Saved

Different links can transmit data at different rates (i.e., different transmission rates).

Question 10 options:

	True
	False

Question 11 (1 point)

Saved

With FDM, the time domain of a link is divided up among the connections established across the link.

Question 11 options:

	True
	False

Question 12 (1 point)

Saved

What is a host?

Question 12 options:

	a. an end system
	b. a network application
	c. a socket
	d. a switch

Question 13 (1 point)

Saved

Which of the following is unlikely to be found in the network edge?

Question 13 options:

	a. a smartphone
	b. a laptop
	c. a core router
	d. a tablet

Question 14 (1 point)

Saved

Packet switching allocates link use for better quality of service than circuit switching.

Question 14 options:

	True
	False

Question 15 (1 point)

Saved

WiFi is by far the most prevalent access technology in corporate and university networks.

Question 15 options:

	True
	False

Question 16 (1 point)

Saved

Suppose users share a 1 Mbps link and each user transmits continuously at 200 Kbps when transmitting. When circuit switching is used, haw many users can be supported?

Question 16 options:

	a. 1
	b. 5
	c. 10
	d. non-deterministic

Question 17 (1 point)

Saved

Which of the following physical media is used for Ethernet LANs?

Question 17 options:

	a. Twisted pairs
	b. Coaxial cables
	c. Fiber optics
	d. Satellite links

Question 18 (1 point)

Saved

Today, most of the servers from which we receive search results, e-mail, Web pages, and videos reside in data centers.

Question 18 options:

	True
	False

Question 19 (1 point)

Saved

Multiple homes share a single access link to the cable headend for cable internet access.

Question 19 options:

	True
	False

Question 20 (1 point)

Saved

Using circuit switching can accommodate more users than using packet switching if the same access link is assumed.

Question 20 options:

	True
	False

Question 21 (1 point)

Saved

Which of the following physical media can be classified into unguided media?

Question 21 options:

	a. 3G
	b. Satellite
	c. LTE
	d. All of the above

Question 22 (1 point)

Saved

Circuit switching is better for providing specified quality of service than packet switching.

Question 22 options:

	True
	False

Question 23 (1 point)

What is a system that multiplexes hundreds of households when using DSL?

Question 23 options:

	a. DSLAM
	b. CMTS
	c. FTTH
	d. ISP

Question 24 (1 point)

_________ is the rate (bits/time unit) at which bits are transferred between two end systems.

Question 24 options:

	a. Bandwidth
	b. Throughput
	c. Delay
	d. Capacity

Question 25 (1 point)

Which working group defines Ethernet standards?

Question 25 options:

	a. IEEE 802.1
	b. IEEE 802.3
	c. IEEE 802.11
	d. IEEE 802.13

Answer 1