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Your school's network has outgrown its designated telco rooms, so you decide to house a few routers in an old janitor's closet temporarily. However, because the closet has no power outlets, you will have to supply the routers power over the network. If you're lucky, your LAN already uses which of the following Ethernet standards that will allow you to do that?
Why is packet switching more efficient than circuit switching?
D. In packet switching, packets can take the quickest route between nodes and arrive independently of when other packets in their data stream arrive.
You are part of a team of engineers who work for an ISP that connects large data centers, telephone companies, and their customers throughout California and Oregon. Management has decided that the company can make large profits by promising the utmost QoS to certain high-profile customers. Which of the following switching methods will best guarantee the promised QoS?
What happens in CSMA/CD when a node detects that its data has suffered a collision?
D. It signals to the network that its data were damaged in a collision, waits a brief period of time before checking the network for activity, and then retransmits the data.
What is the purpose of padding in an Ethernet frame?
A. Ensuring that the frame and data arrive without error.
You are designing a 100Base-T network to connect groups of workstations in two different offices in your building. The offices are approximately 250 meters apart. If you only use repeating devices to connect the workstation groups, how many hubs will you need?
On a 10Base-T network, which of the following best describes how the wires of a UTP cable are used to transmit and receive information?
A. One wire pair handles data transmission, while another wire pair handles data reception.
What technique is used to achieve 1-Gbps throughput over a Cat 5 cable?
A. All four wire pairs are used for both transmission and reception.
Which of the following Ethernet standards is specially encoded for transmission over WANs using SONET technology?
Which two of the following might cause excessive data collisions on an Ethernet network?
A. A server on the network contains a faulty NIC.
C. The overall network length exceeds IEEE 802.3 standards for that network type.
In which of the following examples do the workstations necessarily share a collision domain?
A. Two computers connected to the same hub
Which of the following is the type of 10-gigabite Ethernet that can carry signals the farthest, nearly 25 miles?
The maximum segment length for a 1000Base-FX network depends on which two of the following?
C. Frame type.
The data services company you work for has decided to become an ISP and supply high-capacity Internet connections from its data center. Currently, the data center relies on a 100Base-FX backbone, but your boss demands that the backbone be upgraded to 10GBase-LR. What kind of infrastructure changes would this require?
A. None, because fiber-optic cabling and connectivity devices, including multiplexers, are already in place.
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