network topology

You are asked to upgrade a bus topology LAN at a friends house to a star topology LAN. Your friend wants to connect three computers and a printer and use the Ethernet access method. His computers do not contain wireless NIC's. At minimum, which of the following devices must you add to his current networking hardware?
A hub
Which of the following topologies is susceptible to signal bounce?
What type of topology is required for use with a 100Base-TX network?
Your school's network has outgrown its designated telco rooms, so you decide to house a few routers in an old janitors closet temperarily. However, since 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?
What is the minimum cabling standard rewuired for 10GBase-T Ethernet?
Cat 6
Which of the following is a potential problem with daisy-chaining hubs on a 10Base-T network?
Exceeding the maximum network length
Why is packet switching more efficient than circuit switching?
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 Qo5 to certain high-profile customers. Which of the following switching methods will best guarantee the promised Qo5?
What happens in CSMA/CD when a node detects its data has suffered a collision?
It signals to the network that its data was damaged in a collision, waists a brief period of time before checking the network for activity, and then retransmits the data
Why are Ethernet_2 frames preferred over Ethernet_802.3 frames on contemporary LAN's?
They can support multiple higher-layer protocols, and Ethernet_802.3 frames cannot
What is the purpose of padding in an Ethernet frame?
Ensuring that the data portion of the frame totals at least 46 bytes
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?
One wire pair handles data transmission, while another wire pair handles data reception
What techniwue is used to achieve 1-Gbps throughput over a Cat 5 cable?
All four wire pairs are used for both transmission and reception
Which of the following Ethernet standards is specially encoded for transmission over WAN's using SONET technology?
Which two of the following might cause excessive data collisions on an Ethernet netwok?
The overall network length exceeds IEEE 802.3 standards for that network type and a server on the network contains a faulty NIC
In which of the following examples do the workstations necessarily share a collision domain?
Two computers connected to the same hub
What are the minimum and maximum sizes for an Ethernet frame?
64 and 1518 bytes
Which of the following network technologies does not use circuit switching?
Which of the following is the type of 10Gigabit Ethernet that can carry signals the farthest, nearly 25 miles?