1. Imagine that you are visiting a webpage with an image on it. How does that image get to your computer? Firstly, the image is stored/hosted on a …………………….
2. A user's computer sends a request to a web server for an image. The request is sent in a ……
3. Think of a packet as a virtual parcel with information in it. The two important bits of information are:
4. _______________(and devices called switches) direct the packet from the sender's computer to the required web server.
5. The web server receives the request (for an image) and sends it as packets (routers and switches direct this)
6. Routers try to …………………………... They might take different routes and might not arrive in the same order they were sent.
7. Once packets have been received, the information attached to the packet tells the comptuer how (and what order) to put the packets back together again.
8. The whole process of sending a request and receiving the packets usually takes less than a second!
9. The router is the only device that sees every message sent by any computer on either of the company's networks
10. One of the tools a router uses to decide where a packet should go is a configuration table. A configuration table is a collection of information, including:
11. Which of the following 'jobs' does a router do?
12. There are different types of routers. Simple routers (e.g. at home), slightly larger routers(used to connect a small office to the internet) and large routers that…..
13. One of the crucial tasks for any router is knowing when a packet of information stays on its local network. For this, it uses a mechanism called a ……………………………..
14. The subnet mask looks like an IP address and usually reads "255.255.255.0. Fill in the blanks in the following excerpt.
15. The following excerpt sheds some light on what happens on a busy network. Fill in the blanks.
16. A router will have at least two …………………………….. one physically connected to one network and the other physically connected to another network
17. If we have just 3 networks we can connect them in two different ways; one way is to daisy chain them together using only 2 routers. The other way would be to ………………
18. In configuration 1 if router A or B went down …………………………………………………………………. as there is only one path to it.
19. Routers know the most effective route to use by referring to what is called a metric value. The lowest metric is assumed to be the most efficient.
20. All network devices that use the TCP/IP protocol have a routing table, even your Windows PC has one. ALL devices use their routing table to…..
21. Without a routing table your PC wouldn’t even be able to communicate with computers on the same subnet
22. Before sending a packet your PC looks up the destination …………………... in the routing table to determine the best route possible.
23. If a PC can’t find a matching entry in the routing table it will ……………. It will also……………... if the routing table is wrongly configured.
24. When packets take a certain route to their destination they DO NOT have to take the same route back
25. The main difference between IP routing on the Internet and routing on private networks is how the routing table is built. Private networks tend to use static routing whereas the Internet uses Dynamic Routing.
26. The act of traversing between one router and another across a network is referred to as a …
27. The job of a router is to read the recipient's _____________________ in each packet and forward it on to the recipient via the fastest, least congested route.
28. A router will forward the packet to the next router until the packet reaches its destination. Routers use routing tables to …………………………………… the locations of other network devices.
29. A routing algorithm is used to find the least optimum route.
30. A common shortest path algorithm used in routing is …..