Network-Pretest

What network topology described below?

Each computer/server connected to one single bus cable through

some connector;

Easy to add new machines, but the traffic on the cable reduces the

performances;

One wire only, hence cheap to implement;

High risk of failure (if the cable breaks all the network breaks);

High costs of maintenance;

Adequate for LAN only;

A message is sent on the bus and only the machine with the

identical IP address as in the message filters it and accepts it;

• Star

• Ring

• Bus

• Mesh

What network topology described below?

Each machine of the network has a one-to-one connection to a hub

in the network;

Easy to add new machine to the network;

The hub acts as a repeater of the signal, and can send it to long

distances;

The hub is the only point of failure;

Easy to maintain;

Adequate for LAN, with possibility of getting out of the LAN

through the hub/router;

A message is sent directly to the machine, passing through the hub;

• Star

• Ring

• Bus

• Mesh

1. To ensure data integrity;

2. To control data flow / allow data flow;

3. Provide error checking;

4. To boost connection speed;

5. Minimize congestion;

6. Prevent deadlock;

7. Allows interoperability;

Choose the outline why protocols are necessary...

• 1, 2, 3, 4

• All

• 1, 2, 6, 7

• 4, 5, 6, 7

What network are defined below?

A computer network covering a small physical area;

Whose links do not need telecommunication lines;

Often characterized by high data-transfer rate;

Do not accept “Local Area Network”

• LAN

• WAN

• INTRANET

• VPN

What network device defined below?

A computer (and its software) that provides services available through the network;

• HUB

• ROUTER

• SERVER

• CLIENT

What network device defined below?

A computer/terminal (and its software) used to access the services in a network, by sending requests to the server;

• HUB

• ROUTER

• SERVER

• CLIENT

What network device have role below?

It passes data packets from input channels;

To all output channels;

• HUB

• ROUTER

• SERVER

• CLIENT

A set of rules to coordinate data transmission (between a sender and a receiver) is defined of ...

• Switch

• www

• Firewall

• Protocol

A business can let employees work at home / employees who travel a lot/external

(non-employee) users;

Accessing the data and services (at the office);

Via secure login;

The address is masked;

The location of the user is not known;

May be essential in delicate situations such as political protest groups working from their own country;

Those are outline example of ...

• Intranet

• Extranet

• VLAN

• VPN

One way to protect the computer system from hacker

• Anti Virus

• Spyware software

• Firewall

• Anti Malware