A smart grid network is experiencing both Sybil and blackhole attacks. The network uses a routing protocol that is vulnerable to identity spoofing. The administrator must choose a mitigation that addresses both attacks while minimizing disruption to legitimate traffic. Which approach is most effective?

Implement node authentication and reputation-based routing.

Disable all routing protocol features.

Increase the routing protocol's update frequency.

Which IoT network function is most directly threatened by a Sybil attack?

Physical tamper resistance of devices

Power consumption of sensor nodes

Routing and consensus mechanisms that rely on node identity

Data encryption between devices

Which attack method is BrickerBot known to use to gain access to IoT devices?

Intercepting unencrypted Wi-Fi traffic to steal session tokens

Injecting malicious code through a compromised mobile app

Sending phishing emails to device owners to obtain passwords

Exploiting weak or default credentials on exposed services

What is the primary action of a malicious node in a blackhole attack on an IoT routing protocol?

It advertises itself as having the best route and then drops all received packets

It creates multiple fake identities to influence routing decisions

It modifies the content of packets before forwarding them

It floods the network with route request messages to exhaust bandwidth

EC-CouncilIoT Security Essentials

Domain 4Objective 1

Common IoT Attacks (Mirai, BrickerBot, Sybil, Blackhole) ISE Practice Questions (Page 1)

Part of the IoT Threats and Basic Security domain, which makes up ~17% of our current practice bank. EC-Council does not publish an official question count, but from its 120-minute exam (~50–80 total, ~9–14 in this domain), expect 2–4 from this objective — we provide 27 practice questions to prepare you well beyond it. (estimate)

27questions here

6free pages

4concepts

Questions 1–5

1expert · hard
A smart grid network is experiencing both Sybil and blackhole attacks. The network uses a routing protocol that is vulnerable to identity spoofing. The administrator must choose a mitigation that addresses both attacks while minimizing disruption to legitimate traffic. Which approach is most effective?
Select an answer first
2foundation · easy
Which IoT network function is most directly threatened by a Sybil attack?
Select an answer first
3foundation · easy
Which attack method is BrickerBot known to use to gain access to IoT devices?
Select an answer first
4application · medium
An IoT mesh network is experiencing data loss. A network administrator discovers that a particular node advertises itself as the best route to the gateway but silently drops all received packets. Which attack is this?
Select an answer first
5foundation · easy
What is the primary action of a malicious node in a blackhole attack on an IoT routing protocol?
Select an answer first

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Common IoT Attacks (Mirai, BrickerBot, Sybil, Blackhole) ISE Practice Questions (Page 1)

Questions 1–5

Which IoT network function is most directly threatened by a Sybil attack?

Which attack method is BrickerBot known to use to gain access to IoT devices?

An IoT mesh network is experiencing data loss. A network administrator discovers that a particular node advertises itself as the best route to the gateway but silently drops all received packets. Which attack is this?

What is the primary action of a malicious node in a blackhole attack on an IoT routing protocol?

Keep studying — IoT Threats and Basic Security