Chapter 3 - Router

In an Ethernet network, each information packet sent from a computer is seen by all the other computers on the local network. Each computer then examines the packet and decides whether it was meant for its address.

True

One of the tools a router uses to decide where a packet should go is a ___________________.

configuration table

While most companies also have a special piece of hardware or software called a ____________ to enforce security, the rules in a router's configuration table are important to keeping a company's (or family's) network secure.

firewall

A ____________________ is used by a router to determine if a packet of information stays on its local network.

subnet mask

A router's configuration table is typically as simple as a half-dozen lines, even in very large routers that handle the bulk of Internet messages.

False

Hosts are specialized computers that send your messages and those of every other Internet user speeding to their destinations along thousands of pathways.

False

In a network designed for data there are two huge advantages to packet-switching: • The network can balance the load across various pieces of equipment on a millisecond- by-millisecond basis. • The quality of the line between the source and destination is consistent throughout.

False

Knowing where and how to send a message is the least important job of a router.

False

Routers let messages flow within networks, rather than between networks.

False

The routers that make up the main part of the Internet can reconfigure the paths that packets take because they look at the informaticn surrounding the data packet, and they tell each other about line conditions, such as delays in receiving and sending data and traffic on various pieces of the network.

True

A computer's NIC typically has a single physical address, but may have multiple logical addresses.

True

A router has two separate but related jobs: • The router ensures that information doesn't go where it's not needed. This is crucial for keeping large volumes of data from clogging the connections of "innocent bystanders." • The router makes sure that information does make it to the intended destination.

True

If a company employs a router to create and interconnect two separate networks, the router is the only device that sees every message sent by any computer on either of the company's networks.

True

Internet data travels over a system known as a _______________ network.

packet-switching

In a Microsoft Windows-based system, use the ______________ command to trace the route that a packet of information takes to get from your computer to another computer connected to the Internet.

tracert

Which of the following is not included in a router's configuration table? • IP addresses for all hosts on the local network • Information on which connections lead to particular groups of addresses • Priorities for connections to be used • Rules for handling both routine and special cases of traffic • None of these choices

• IP addresses for all hosts on the local network

Which of the following is not typically displayed by the Windows ipconfig /all command? • NetBIOS scope ID • physical address • DHCP server • subnet mask • None of these choices

• NetBIOS scope ID

Which of the following is not a task that a router may perform when joining two networks? • None of these choices • Passes information from one to the other • Translates various protocols between the two networks • Prevents the traffic on one from unnecessarily spilling over to the other • Translates various protocols between the two networks, and prevents the traffic on one from unnecessarily spilling over to the other

• None of these choices

Which of the following is not a step that may be taken by a router when determining the path a particular packet should take? • None of these choices. • Router scans the destination address and matches the IP address against rules in the configuration table. • Packet is determined to belong to a particular group of addresses and should go in a specific direction. • Connection is found with the best performance at a given moment. • Alternate connection is chosen and checked.

• None of these choices.

Which of the following is not displayed by the Traceroute command? • None of these choices. • The number of routers between your computer and the destination. • How long it takes a packet of information to move from your computer to the destination and back again. • The "name" of the router or server. • The IP address of each computer or router.

• None of these choices.