Client Server and Peer to Peer Networks

Client Server and Peer to Peer Networks

by Ben Dobson

Open Ended

What does a file server do?

Open Ended

What does a print server do?

Open Ended

What does a mail server do?

Open Ended

What does a web server do?

Open Ended

What does a database server do?

Open Ended

Are all servers powerful computers? (i.e. what about a print server?)

Open Ended

What are the advantages of the using servers (using a client server role?)

Think of each of the servers and think of advantages...file, print, mail, web, database.

Open Ended

Try to come up with some advantages of peer to peer networks

Open Ended

•Peer to peer networks are often used in home setups or a small office with few computers

•Try to think of some disadvantages

Open Ended

•What happens if a computer loses some data due to hard drive failure/problem?

Open Ended

•How will you know where to find a file?

​••How will you know where to find a file?

Without a central file server you will have to know which machine/person has the file or ask people to find out.​

Open Ended

•What about if a computer is swithed off?

Multiple Select

Which of the following apply to peer to peer networks?

• Each computer needs to be backed up

  (files copied somewhere else)

• Security is controlled by each individual machine

• A central backup server backs up all file servers

• Security is controlled by a central server

Multiple Select

Which of the following apply to client server networks?

• Each computer needs to be backed up

  (files copied somewhere else)

• Security is controlled by each individual machine

• A central backup server backs up all file servers

• Security is controlled by a central server

Multiple Select

Which of the following apply to peer to peer networks?

• All users are reliant on the central server

• Using servers helps businesses to grow to hundreds or thousands of computers and users

• There is no central server. If one computer goes down then only its services are lost

• Peer-to-peer networks are difficult to maintain beyond a few computers

Multiple Select

Which of the following apply to client server networks?

• All users are reliant on the central server

• Using servers helps businesses to grow to hundreds or thousands of computers and users

• There is no central server. If one computer goes down then only its services are lost

• Peer-to-peer networks are difficult to maintain beyond a few computers

Open Ended

Using the client-server model, a school network uses a central file server to manage their files.

(a)Briefly explain the role of a server when a file is requested by a client terminal.

(b)   Briefly explain the role of the client computer in this relationship.

Open Ended

(c)  List some of the data that is held on a school server for use by:

•(i)   Students.

•(ii)   Teachers.

•(iii)  The school administration.

​Task 1

(c)  List some of the data that is held on a school server for use by:

(i)   Students.

  Homework essays, spreadsheets etc. Work that you have done for clubs, activities, journalism etc.

(ii)   Teachers.

  Class marks and pupil reports, registration details, teaching files.

(iii)  The school administration.

  Pupil and parent details, school calendar, sports results, exam results.

Open Ended

•(iv)  How are the PCs in the classroom likely to be connected to the school server?

​•(iv)  How are the PCs in the classroom likely to be connected to the school server?

​  Via network cable. Also possibly via Wi-Fi.

Open Ended

•(v)  The file server manages data files held on the server. What other types of server may be needed to run the school network efficiently? Explain briefly what each one does.

​•(v)  The file server manages data files held on the server. What other types of server may be needed to run the school network efficiently? Explain briefly what each one does.

​   Print server to organise printing.

  An email server may receive emails, detect and block spam, distribute emails to users.

  A web server may host the school’s external website (although this is likely to be hosted by an external web host).

  A database server to hold school records.

Open Ended

(d)  Give two advantages of a client-server network over a peer-to-peer network

​(d)  Give two advantages of a client-server network over a peer-to-peer network

​ A central server manages security and backup.

Complex processing tasks may be performed by a more powerful server enabling less powerful client terminals to be used.

Open Ended

What does a web server do?

What is the protocol that web servers use?

What type of files are distributed?

Open Ended

What is web hosting? (Google)

Open Ended

What is the cloud?(in computer technology...google it)

There are two main types of cloud services what are they?

Open Ended

If you were a company like rolls royce aerospace (who have trade secrets about how they make their jet engines) would be totally happy keeping your data on amazon's cloud servers? Why not?

Multiple Choice

Which one of the following is an advantge of copper cables ?

• •tried and trusted technology

  •relatively inexpensive

• •very fast data transmission

  •low loss of signal over distance

  •not affected by magnetic or electric fields

  •require very little power

  •more difficult to ‘tap into’ than copper cables

• •no need for trailing wires (safer)

  •allows devices to be used anywhere provided there is a signal

  •easier to add devices to a network

Multiple Choice

Which one of the following is an advantge of wireless connection ?

• •tried and trusted technology

  •relatively inexpensive

• •very fast data transmission

  •low loss of signal over distance

  •not affected by magnetic or electric fields

  •require very little power

  •more difficult to ‘tap into’ than copper cables

• •no need for trailing wires (safer)

  •allows devices to be used anywhere provided there is a signal

  •easier to add devices to a network

Multiple Choice

Which one of the following is an advantge of optical fibre connection ?

• •tried and trusted technology

  •relatively inexpensive

• •very fast data transmission

  •low loss of signal over distance

  •not affected by magnetic or electric fields

  •require very little power

  •more difficult to ‘tap into’ than copper cables

• •no need for trailing wires (safer)

  •allows devices to be used anywhere provided there is a signal

  •easier to add devices to a network

Multiple Choice

Which one of the following is an disadvantage of optical fibre connection ?

• •signal affected by electric and magnetic fields

  •low bandwidth

  •heavy cables

• •high cost to set up

  •need for expensive optical transmitters and receivers

• •data transmission rate less than wired systems

  •signal can be blocked by objects or walls

  •increased security issues

Multiple Choice

Which one of the following is an disadvantage of wireless connection ?

• •signal affected by electric and magnetic fields

  •low bandwidth

  •heavy cables

• •high cost to set up

  •need for expensive optical transmitters and receivers

• •data transmission rate less than wired systems

  •signal can be blocked by objects or walls

  •increased security issues

Multiple Choice

Which one of the following is an disadvantage of copper cable connection ?

• •signal affected by electric and magnetic fields

  •low bandwidth

  •heavy cables

• •high cost to set up

  •need for expensive optical transmitters and receivers

• •data transmission rate less than wired systems

  •signal can be blocked by objects or walls

  •increased security issues

Open Ended

•There are several factors that affect the performance of a network including:

•Bandwidth

•Latency

•Error rate/collisions

•What do each of these terms mean?

Multiple Choice

•There are several factors that affect the performance of a network including:

•Bandwidth

means

• How long it takes a packet to be received after requesting it

• How much data can be transfered per second

• How often a packet is corrupt (has error in data)

Multiple Choice

•There are several factors that affect the performance of a network including:

Latency

• How long it takes a packet to be received after requesting it

• How much data can be transfered

• How often a packet is corrupt (has error in data)

Multiple Choice

•There are several factors that affect the performance of a network including:

Latency

• How long it takes a packet to be received after requesting it

• How much data can be transfered

• How often a packet is corrupt (has error in data)