IB Computer Science Topic C.5.3 Web Graph Features Revision Notes (SL/HL)

IB Computer Science Topic C.5.3 Web Graph Features Revision Notes (SL/HL) | RevisionDojo

Key Features of the Web Graph

Note

The web graph is a directed graph, meaning the edges have a direction.
If page A links to page B, there is an edge from A to B, but not necessarily from B to A.

Bowtie Structure

The bowtie structure is a model that describes the overall shape of the web graph. It divides the web into several distinct regions:

Strongly Connected Core (SCC): A large central component where every page can be reached from any other page via a series of hyperlinks.
IN Component: Pages that can reach the SCC but cannot be reached from it.
OUT Component: Pages that can be reached from the SCC but cannot reach it.
Tendrils: Pages that are connected to the IN or OUT components but not to the SCC.
Disconnected Components: Pages that are completely isolated from the main structure.

Example

Consider a university website:

The homepage is part of the SCC because it links to and is linked from many other pages.
An old event page might be in the OUT component if it is linked from the homepage but doesn't link back.
A personal blog that links to the university but isn't linked from it would be in the IN component.

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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.

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

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

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

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

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

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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Key Features of the Web Graph

Note

The web graph is a directed graph, meaning the edges have a direction.
If page A links to page B, there is an edge from A to B, but not necessarily from B to A.

Bowtie Structure

The bowtie structure is a model that describes the overall shape of the web graph. It divides the web into several distinct regions:

Strongly Connected Core (SCC): A large central component where every page can be reached from any other page via a series of hyperlinks.
IN Component: Pages that can reach the SCC but cannot be reached from it.
OUT Component: Pages that can be reached from the SCC but cannot reach it.
Tendrils: Pages that are connected to the IN or OUT components but not to the SCC.
Disconnected Components: Pages that are completely isolated from the main structure.

Example

Consider a university website:

The homepage is part of the SCC because it links to and is linked from many other pages.
An old event page might be in the OUT component if it is linked from the homepage but doesn't link back.
A personal blog that links to the university but isn't linked from it would be in the IN component.

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.

1. System fundamentals2 subtopics

2. Computer organization1 subtopic

3. Networks1 subtopic

4. Computational thinking, problem-solving and programming3 subtopics

5. Abstract data structures (HL)1 subtopic

6. Resource management (HL)1 subtopic

7. Control (HL)1 subtopic

A. Databases4 subtopics

B. Modelling and simulation4 subtopics

C. Web science6 subtopics

D. Object-oriented programming (OOP)4 subtopics

IB Computer Science C.5.3 Web Graph Features Notes

1. System fundamentals2 subtopics

2. Computer organization1 subtopic

3. Networks1 subtopic

4. Computational thinking, problem-solving and programming3 subtopics

5. Abstract data structures (HL)1 subtopic

6. Resource management (HL)1 subtopic

7. Control (HL)1 subtopic

A. Databases4 subtopics

B. Modelling and simulation4 subtopics

C. Web science6 subtopics

D. Object-oriented programming (OOP)4 subtopics

Key Features of the Web Graph

Bowtie Structure

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

Key Features of the Web Graph

Bowtie Structure

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