الرئيسية » جامعة نزوى » Summary of COMP-B ,, ملخص كومب B

Summary of COMP-B ,, ملخص كومب B

ملخص لمادة  COMP-B بجامعة نزوى

من إعداد إسلام أحمد علي عبدالعزيز أحمد

A summary of COMP-B
BY:Islam Ahmed Ali

———Lesson 41————-

Internet is international computer network, similar in design to worldwide telephone network

Protocol: Rules used by electronic devices to communicate with each other. HTTP or FTP are the primary examples.

Types of networks:

  1. WAN
  2. LAN
  3. Client and server
  4. Peer to peer
  5. Internet
  6. Intranet
  7. Extranet
WAN LAN
Wade area network Local area network
Two or more LANs connected together All computers in same builiding

 

 


Client and server Peer to peer
Used in large companies Used for home small office
Expensive inexpensive
Client> request services from server> provide that request All computer have equal authority




Internet Intranet Extranet
More bigger Bigger Smaller
Tcp/IP Tcp/IP Tcp/IP
International Set up with more than organizations Set up with organization
Larger security Medium security Smaller security

Benefits of Networking:

  1. Communicating
  2. Sharing Resources

Disadvantages of Networking:

  1. Dependency
  2. Security Risks
  3. Loss of Autonomy or Privacy
  4. Networks vulnerable to virus attacks

How to connected computer to network?

  1. Wire
  2. Wireless

Coaxial Copper wire surrounded with insulation and grounded cover of braided wire to minimize electrical and radio frequency interference; main type of cable used for cable television distribution and computer networks.
Fiber Optics Bundled glass or plastic fibers to transmit data; much larger bandwidth for transmitting data and less susceptible to interference.
Twisted Pair Type of cable containing 1 to 4 pairs of copper wires carrying analog or digital signals; telephone and computer networks commonly use this form of connection.
Wireless Each computer must have wireless network interface card and access point; work with radio frequencies for data transmission.
Infrared Works with infrared light waves to transmit data; downside is distance between infrared devices must be less than wireless device using radio frequencies. Infrared transmitter must be pointed at receiver, or beam diluted and signal strength too weak to register.

———Lesson 42————-

Electronic Communication refers to any process that enables you to communicate and interact with other using an electronic method such as:

  • Electronic Mail
    • Commonly known as e-mail and requires valid address to send messages
  • Instant Messages
    • Similar to having conversation involving two or more people, except in text and only one comment at a time can be received by everyone in that conversation
  • Text Messages
    • Similar to instant messages except created and sent from cellular phones with limit on number of characters allowed per message
  • VoIP
    • Voice over Internet Protocol; uses digital format that follows Internet protocol to enable audio conversations by two or more people in different areas
  • Online Conferencing
    • Enables numerous people to meet online using software designed for Internet use
  • Chat Rooms
    • Can participate in main discussion or you can go into separate “room” for different or private conversation
  • Social Networking Sites
    • Web sites you can join to connect with people you know or to meet new people
    • Create a profile and post pictures, video, or text about yourself, or play games
  • Blogs
    • Used as journals where one person writes on specific topic, and others then post comments for that topic
  • Message Boards or Newsgroups
    • Similar to bulletin boards where you can post comment about topic although you may have to subscribe to newsgroup

mailbox@organization.domain

  • Mailbox Name: Identifies particular mailbox on e-mail server
  • Name of Organization: Identifies organization that owns server
  • Domain Category: Identifies type of domain

Identifies who will receive e-mail:

To  to the targeted e-mail as primary recipient.
Cc “ carbon copy”  to people just for their information.
Bcc “ blind carbon copy” to people just for their information and their e- mails are hidden
  • Subject Line
    • Identifies topic of message, and usually short description of content or purpose of e‑mail
  • Body
    • Where you type body of message
  • Attachments
    • When you want others to receive specific files

Most e-mail programs filter and block spam or other junk e-mail

  • To avoid being placed on list that results in you receiving spam messages:
    • Do not allow e-mail address to be added to any marketing address lists
    • Set up e-mail account with Web-based e-mail for these types of requests
    • Do not reply to e-mail that is junk even if message says name will be removed
    • Avoid giving e-mail address on any online forums or newsgroups

Avoid being flagged as spam by other servers by following general guidelines for sending e-mail

Identifying Common Problems:

  • Lost connection 
  • Messages not being sent or received
  • Delivery failure message 
  • Garbled messages
  • Cannot download items 
  • Junk mail
  • Viruse
  • Hoaxes 

———Lesson 43————-

What is Microsoft Outlook?

E-mail or electronic mail is the transmission of electronic messages over the internet.

Web-based email accounts do not require an e-mail program to be installed on your. Example: Google’s Gmail, Microsoft’s Hotmail, and Yahoo Mail.

Maintaining Outlook:

  1. Sending Out-of-Office Notices
  2. Staying Up to Date

ملخص لمادة  COMP-B بجامعة نزوى

من إعداد إسلام أحمد علي عبدالعزيز أحمد

 A summary of COMP-B
BY:Islam Ahmed Ali

يمنع النسخ دون ذكر المصدر

بالتوفيق للجميع

عن Islam Ahmed

إسلام أحمد، هو شاعر ومبرمج وممثل مسرحي ولد في جمهورية مصر العربية و عاش و ترعرع في سلطنة عمان , طالب جامعي بكلية الهندسة ومؤسس شركة أنجز ويب لخدمات الويب المتكاملة ومؤسس منتديات العرب أشقاء سابقا ومجلة أنجز ويب حاليا.

شاهد أيضاً

(مكاشفات) تحلق في فضاءات مهرجان الدن المسرحي في سلطنة عمان

(مكاشفات) تحلق في فضاءات مهرجان الدن المسرحي في سلطنة عمان / عبد العليم البناء الرائعة …

اترك رد

هذا الموقع يستخدم Akismet للحدّ من التعليقات المزعجة والغير مرغوبة. تعرّف على كيفية معالجة بيانات تعليقك.