Exam Cram Ch 4

What is the theoretical download speed possible with WiMax? ❍ A. 84Mbit/s ❍ B. 100Mbit/s ❍ C. 1Gbit/s ❍ D. 10Gbit/s

1Gbit/s

What is the speed usually offered with dialup service? ❍ A. 1Gbps ❍ B. 256Kbps ❍ C. 144Kbps ❍ D. 56Kbps

56kbps

What acts as a translator between the LAN and WAN data formats?

A CSU/DSU acts as a translator between the LAN and WAN data formats.

Several users on your network are downloading from peer-to-peer networks, tying up bandwidth during peak hours. Which of the following is used to manage network bandwidth? ❍ A. Load leveler ❍ B. Load toner ❍ C. Bandwidth toner ❍ D. Bandwidth shaper

Bandwidth shaper

What is the term that describes the mechanisms used to control bandwidth usage on the network?

Bandwidth shaping describes the mechanisms used to control bandwidth usage on the network.

Which of the following best describes the process to create a dedicated circuit between two communication endpoints and direct traffic between those two points? ❍ A. Multiplexing ❍ B. Directional addressing ❍ C. Addressing ❍ D. Circuit switching

Circuit switching

What is the difference between circuit switching and packet switching?

Circuit switching offers a dedicated transmission channel that is reserved until it is disconnected. Packet switching enables packets to be routed around network congestion.

True or False: A load balancer must be a hardware device specially configured to balance the load.

False

Which of the following technologies is known as a 3G transitional technology that supports legacy architecture? ❍ A. HSPA+ ❍ B. LTE ❍ C. WiMax ❍ D. PON

HSPA+

Which of the following devices forwards data packets to all connected ports? ❍ A. Router ❍ B. Switch ❍ C. Bridge ❍ D. Hub

Hub

What are the types of ports found on hubs and switches?

Hubs and switches have two types of ports: Medium-Dependent Interface (MDI) and Medium-Dependent Interface Crossed (MDI-X).

What is the difference between an active and passive hub?

Hubs can be either active or passive. Hubs are considered active when they regenerate a signal before forwarding it to all the ports on the device.

Which of the following technologies require dialup access? (Choose the two best answers.) ❍ A. FDDI ❍ B. ISDN ❍ C. Packet switching ❍ D. The PSTN

ISDN the PSTN

Which of the following is an advantage of ISDN over the PSTN? ❍ A. ISDN is more reliable. ❍ B. ISDN is cheaper. ❍ C. ISDN is faster. ❍ D. ISDN uses 53Kbps fixed-length packets.

ISDN is faster

On an ISDN connection, what is the purpose of the D channel? ❍ A. It carries the data signals. ❍ B. It carries signaling information. ❍ C. It enables multiple channels to be combined to provide greater bandwidth. ❍ D. It provides a temporary overflow capacity for the other channels.

It carries signaling information

Which of the following statements best describes a gateway? ❍ A. It is a device that enables data to be routed from one network to another. ❍ B. It refers to any device that resides at the entrance of a network. ❍ C. It is a device, system, or application that translates data from one format into another. ❍ D. It is a network device that can forward or block data based on the MAC address embedded in the packet.

It is a device, system, or application that translates data from one format into another.

Which of the following is the time lapse between sending or requesting information and the time it takes to return? ❍ A. Echo ❍ B. Attenuation ❍ C. Bandwidth ❍ D. Latency

Latency

When a vendor offers to provide all networking for a client—freeing the company from needing to worry about bandwidth, connectivity, scalability, and all the issues normally associated with networking—what is it known as? ❍ A. SaaS ❍ B. NaaS ❍ C. SAN ❍ D. NAS

NaaS

Which of the following is an open source virtual switch? ❍ A. VirtualBox ❍ B. VMware ❍ C. Xen ❍ D. Open vSwitch

Open vSwitch

Which of the following statements are true of ISDN? (Choose the two best answers.) ❍ A. BRI ISDN uses two B+1 D channels. ❍ B. BRI ISDN uses 23 B+1 D channels. ❍ C. PRI ISDN uses two B+1 D channels. ❍ D. PRI ISDN uses 23 B+1 D channels.

PRI ISDN uses 23 B+1 D channels. BRI ISDN uses two B+1 D channels.

What is the major difference between a hub and a switch?

Rather than forwarding data to all the connected ports, a switch forwa

On a typical cable modem, which panel light is found beneath the power light? ❍ A. Receive ❍ B. Send ❍ C. Online ❍ D. Activity

Receive

Which of the following circuit-switching strategies does ATM use? (Choose the two best answers.) ❍ A. SVC ❍ B. VCD ❍ C. PVC ❍ D. PCV

SVC PVC

Of the following routing methods, which is likely to require the most administration time in the long term? ❍ A. Static ❍ B. Link state ❍ C. Distance vector ❍ D. Dynamic

Static

Users are complaining that the network's performance is unsatisfactory. It takes a long time to pull files from the server, and, under heavy loads, workstations can become disconnected from the server. The network is heavily used, and a new videoconferencing application is about to be installed. The network is a 1000BaseT system created with Ethernet hubs. Which device are you most likely to install to alleviate the performance problems? ❍ A. Switch ❍ B. Router ❍ C. Bridge ❍ D. Gateway

Switch

Which of the following devices passes data based on the MAC address? ❍ A. Hub ❍ B. Switch ❍ C. MSAU ❍ D. Router

Switch

What are T-lines used for, and what is the maximum speed of T1 and T3?

T-carrier lines create point-to-point network connections for private networks. T1 lines offer transmission speeds of up to 1.544Mbps, whereas T3 lines offer transmission speeds of 44.736Mbps.

Your company currently uses a standard PSTN communication link to transfer files between LANs. Until now, the transfer speeds have been sufficient for the amount of data that needs to be transferred. Recently, a new application was purchased that requires a minimum transmission speed of 1.5Mbps. You have been given the task to find the most cost-effective solution to accommodate the new application. Which of the following technologies would you use? ❍ A. T3 ❍ B. X.25 ❍ C. T1 ❍ D. BRI ISDN

T1

You have been hired to establish a WAN connection between two offices: one in Vancouver and one in Seattle. The transmission speed can be no less than 2Mbps. Which of the following technologies could you choose? ❍ A. T1 ❍ B. PSTN ❍ C. T3 ❍ D. ISDN

T3

What is the point of demarcation with a small office?

The point of demarcation is always the point where the service provider stops being responsible for the wiring and it becomes your responsibility.

On a virtual desktop what is the term that encompasses the software and hardware needed to create the virtual environment?

The virtual desktop is often called a virtual desktop interface (VDI) and that term encompasses the software and hardware needed to create the virtual environment.

Which of the following is true of many SOHO routers? ❍ A. They close down the DHCP ports by default. ❍ B. They close down the NAT ports by default. ❍ C. They close down the ICMP ports by default. ❍ D. They leave open the DHCP, NAT, and ICMP ports by default

They close down the ICMP ports by default

5. You are experiencing performance problems on your Ethernet-based network. By using a network performance-monitoring tool, you determine that the network has a large number of collisions. To reduce the collisions, you decide to install a network bridge. What kind of bridge are you most likely to implement? ❍ A. Collision bridge ❍ B. Transparent bridge ❍ C. Visible bridge ❍ D. Translational bridge

Transparent bridge

True or False: Cable modems and DSL modems are commonly used in SOHO implementations for Internet access.

True

True or False: NaaS is similar to the Software as a Service (SaaS) cloud computing model in that it is provided on demand in a pay-as-you-go model.

True

Which of the following technologies requires a logical connection between the sending and receiving devices? ❍ A. Circuit switching ❍ B. Virtual-circuit packet switching ❍ C. Message switching ❍ D. High-density circuit switching

Virtual circuit packet switching

Which of the following provides public hotspots for wireless Internet access? ❍ A. WISP ❍ B. WASP ❍ C. WSP+ ❍ D. WPST

WISP

What are the X.25 transmission speed restrictions?

X.25 is restricted to transmission rates of 56Kbps or 64Kbps with digital implementations.

Due to recent cutbacks, your boss approaches you, demanding an alternative to the company's costly dedicated T1 line. Only small amounts of data require transfer over the line. Which of the following are you likely to recommend? ❍ A. ISDN ❍ B. FDDI ❍ C. The PSTN ❍ D. X.25

the PSTN