IB Computer Science Topic A2.2.2 Function of Servers Revision Notes (HL)

IB Computer Science Topic A2.2.2 Function of Servers Revision Notes (HL) | RevisionDojo

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Functions of Servers

Servers are specialized computer systems designed to provide services, data, or resources to other computers, known as clients, over a network.
They are the backbone of modern computing, enabling everything from web browsing to email communication.

Types of Servers

Domain Name System (DNS) Server

Analogy

DNS essentially is your computer’s contact book.
Humans look for Google.com, the DNS looks up the name and returns the IP Address required to establish the connection.
Just as you would look up a name in a phones contacts before dialling.

Function: Translates human-readable domain names (e.g., www.google.com) into numerical IP addresses (e.g., 172.217.16.14).
1. Communication over a network uses IP Address, while humans use domain names to help remember them
Scalability: DNS servers are highly scalable, using a hierarchical structure to distribute queries across multiple servers.
Reliability: Redundancy and caching ensure high availability and fast response times.
Security: DNSSEC (Domain Name System Security Extensions) adds a layer of security by authenticating responses.

Note

DNS servers are critical for internet functionality, as they enable users to access websites without remembering complex IP addresses.

Dynamic Host Configuration Protocol (DHCP) Server

Function: Automatically assigns IP addresses and network configuration parameters to devices.
Scalability: Supports large networks by dynamically allocating IP addresses from a predefined pool.
Reliability: Redundancy is achieved by deploying multiple DHCP servers.
Security: Can be configured to assign static IPs to specific devices, enhancing security.

Example

When a new device connects to a Wi-Fi network, the DHCP server assigns it an IP address, allowing it to communicate with other devices.

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

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Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

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Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Functions of Servers

Servers are specialized computer systems designed to provide services, data, or resources to other computers, known as clients, over a network.
They are the backbone of modern computing, enabling everything from web browsing to email communication.

Types of Servers

Domain Name System (DNS) Server

Analogy

DNS essentially is your computer’s contact book.
Humans look for Google.com, the DNS looks up the name and returns the IP Address required to establish the connection.
Just as you would look up a name in a phones contacts before dialling.

Function: Translates human-readable domain names (e.g., www.google.com) into numerical IP addresses (e.g., 172.217.16.14).
1. Communication over a network uses IP Address, while humans use domain names to help remember them
Scalability: DNS servers are highly scalable, using a hierarchical structure to distribute queries across multiple servers.
Reliability: Redundancy and caching ensure high availability and fast response times.
Security: DNSSEC (Domain Name System Security Extensions) adds a layer of security by authenticating responses.

Note

DNS servers are critical for internet functionality, as they enable users to access websites without remembering complex IP addresses.

Dynamic Host Configuration Protocol (DHCP) Server

Function: Automatically assigns IP addresses and network configuration parameters to devices.
Scalability: Supports large networks by dynamically allocating IP addresses from a predefined pool.
Reliability: Redundancy is achieved by deploying multiple DHCP servers.
Security: Can be configured to assign static IPs to specific devices, enhancing security.

Example

When a new device connects to a Wi-Fi network, the DHCP server assigns it an IP address, allowing it to communicate with other devices.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A1 Computer fundamentals4 subtopics

A2 Networks4 subtopics

A3 Databases4 subtopics

A4 Machine learning4 subtopics

B1 Computational thinking1 subtopic

B2 Programming5 subtopics

B3 Object-oriented programming2 subtopics

B4 Abstract data types (HL only)1 subtopic

IB Computer Science Topic A2.2.2: Function of Servers Notes

A1 Computer fundamentals4 subtopics

A2 Networks4 subtopics

A3 Databases4 subtopics

A4 Machine learning4 subtopics

B1 Computational thinking1 subtopic

B2 Programming5 subtopics

B3 Object-oriented programming2 subtopics

B4 Abstract data types (HL only)1 subtopic

Functions of Servers

Types of Servers

Domain Name System (DNS) Server

Dynamic Host Configuration Protocol (DHCP) Server

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Functions of Servers

Types of Servers

Domain Name System (DNS) Server

Dynamic Host Configuration Protocol (DHCP) Server

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account