All MCQs

High-betweenness nodes can act as brokers or bridges between groups.
Their removal may disrupt communication across the network.

In an undirected network, degree is the count of adjacent edges.
In directed networks, in-degree and out-degree are distinguished.

Communities often correspond to social circles, interests, or functional groups.
They are based on network connectivity rather than ordinary feature distance alone.

A link from an important page contributes more than a link from an unimportant page.
The method models a random surfer moving through the link graph.

Clickstreams, sessions, and server logs reveal navigation behavior.
Applications include personalization and website optimization.

Pages are nodes and hyperlinks are directed edges.
Link analysis can identify authority, importance, and communities.

Web content includes text, images, metadata, and structured page elements.
Methods such as text mining and information extraction are commonly used.

Different thresholds trade false positives against missed anomalies.
The right choice depends on risk, capacity, and class prevalence.

Predicting every case as normal can achieve high accuracy.
Minority-focused metrics provide a more meaningful evaluation.

Recall measures the fraction of actual anomalies detected.
High recall is vital when false negatives are costly.

Precision indicates how many alerts are truly anomalous.
Low precision creates operational cost and alert fatigue.

The method distinguishes the normal data region from the origin or outside space.
New points beyond the learned boundary are flagged.