Nicholas Bagnall
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Practice exam questions for FIT3031 Network Security Exam

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Nicholas Bagnall
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FIT3031 - Network Security Exam Practice

Question 1 of 52

1

Which of the following algorithm is a symmetric encryption algorithm?

Select one of the following:

  • RSA

  • Diffie-Hellman

  • SHA-256

  • DES

Explanation

Question 2 of 52

1

Which of the following attacks are active attacks?
- Replay
- Modification of Message
- Denial of Service

Select one of the following:

  • Replay

  • Modification of Message

  • Denial of Service

  • All of the above

Explanation

Question 3 of 52

1

Which of the following statement(s) regarding symmetric encryption is/are not true?

Select one of the following:

  • The encryption key is the same as decryption key

  • Symmetric key encryption is slower than asymmetric key encryption

  • AES can be speed up using hardware module

  • All of the above statements are not true

Explanation

Question 4 of 52

1

Which of the following encryption algorithm is NOT used in 4G LTE?

Select one of the following:

  • SNOW 3G

  • AES

  • 3DES

  • ZUC

Explanation

Question 5 of 52

1

Asymmetric encryption can solve the __________ problem(s) of symmetric encryption.

Select one of the following:

  • Key distribution

  • Integrity

  • Efficiency

  • All of the above

Explanation

Question 6 of 52

1

Which of the following statement regarding SHA-1 is true?

Select one of the following:

  • CWI Amsterdam and Google had performed a collision attack against SHA-1, publishing two dissimilar PDF files which produce the same SHA-1 hash.

  • CWI Amsterdam and Google had invented a polynomial time algorithm to find two different integers which produce the same SHA-1 hash.

  • CWI Amsterdam and Google had performed a one-wayness attack against SHA-1, such that given any random 160-bit string, they can re-construct a PDF file which produces this SHA-1 hash.

  • CWI Amsterdam and Google had invented a polynomial time algorithm to find the input of the hash function x, for any given 160-bit integer y such that H(x)=y where H( ) is the SHA-1 function.

Explanation

Question 7 of 52

1

The security of Diffie-Hellman Algorithm relies on the __________ problem.

Select one of the following:

  • Factorisation

  • Subset sum

  • Discrete logarithm (DL)

  • Learning with errors (LWE)

Explanation

Question 8 of 52

1

IPSec is used to secure the __________ layer.

Select one of the following:

  • Application

  • TCP

  • Network Layer (IP)

  • Physical

Explanation

Question 9 of 52

1

X.509 is a standard of __________ .

Select one of the following:

  • Digital Signature

  • Email Security

  • Wireless LAN Security

  • Digital Security

Explanation

Question 10 of 52

1

Which of the following activities are examples of Intrusion?
A) Cracking password
B) Distributing pirated software
C) Using e-banking service from a web browser in a library public computer during opening hours

Select one of the following:

  • Both A and B

  • Both B and C

  • Both A and C

  • All of the above

Explanation

Question 11 of 52

1

SSH is an encrypted version of ______

Select one of the following:

  • MIME

  • HTTP

  • TELNET

  • Internet Protocol

Explanation

Question 12 of 52

1

Cloning of 4G SIM card can be done using __________ attack.

Select one of the following:

  • Man-in-the-middle

  • SQL Injection

  • Denial of Service

  • Side Channel

Explanation

Question 13 of 52

1

Which of the following statement(s) describe(s) correctly the difference(s) between a virus and a worm?

Select one of the following:

  • A virus cannot be spread without a human action, but a worm has the capacity to travel without any human action.

  • A virus does not have the dormant phase, but a worm does have.

  • In the propagation phase, a virus searches for other systems but a worm only searchers for other programs running within the same system.

  • All of the above are correct

Explanation

Question 14 of 52

1

Which of the following is/are the limitation(s) of a firewall?

Select one of the following:

  • Cannot protect from attacks bypassing it

  • Cannot protect against internal threat

  • All of the above are limitations of a firewall

  • There is no limitation of a firewall

Explanation

Question 15 of 52

1

What are two security services provided by signcryption?

Select one of the following:

  • Confidentiality and Integrity

  • Confidentiality and Availability

  • Integrity and Availability

Explanation

Question 16 of 52

1

What is meant by "Access Control"?

Select one of the following:

  • A. The act of keeping unauthorised personel out of a system.

  • B. The act of allowing only authorised users into a system.

  • C. Authentication

  • All of the above

Explanation

Question 17 of 52

1

A loss of integrity is unauthorised modification of data during the communication.

Select one of the following:

  • True
  • False

Explanation

Question 18 of 52

1

IPSec encapsulation mode provides protection to the entire IP packet.

Select one of the following:

  • True
  • False

Explanation

Question 19 of 52

1

Machine learning based intrusion detection systems are likely to produce false positives
during traffic analysis.

Select one of the following:

  • True
  • False

Explanation

Question 20 of 52

1

DDoS attacks cannot be launched at the application layer.

Select one of the following:

  • True
  • False

Explanation

Question 21 of 52

1

Which of the following is an example aspect of network security?

Select one of the following:

  • Wireless security

  • Physical security

  • Human input errors

Explanation

Question 22 of 52

1

Ciphertext-only capability means that: ______________.

Select one of the following:

  • Only decryption can be performed on the ciphertexts

  • The adversary can only access to the ciphertexts

  • The adversary can only decrypt chosen ciphertexts

Explanation

Question 23 of 52

1

PGP provides confidentiality through the use of ____________________.

Select one of the following:

  • Symmetric block encryption

  • Radix-64

  • Digital signatures

Explanation

Question 24 of 52

1

In IPSec, authentication NOT applied to the entire original IP packet is ______________.

Select one of the following:

  • Cipher mode

  • Transport mode

  • Tunnel mode

Explanation

Question 25 of 52

1

Which is FALSE regarding VPN?

Select one of the following:

  • VPN server should be placed in front of firewall if the firewall needs to inspect the packet payloud.

  • VPN server can only be established by IP security.

  • VPN can build multiple overlaying networks that share the same physical network.

Explanation

Question 26 of 52

1

How does a TCP flooding attack occur?

Select one of the following:

  • Transport layer security (TLS) only secures communication between email servers and does not protect between client and server. This means all intermediate hops see plaintext. Hackers and government agencies can utilise this to their advantage. Google uses their key to encrypt emails and can decrypt the emails when requested.

  • During a TCP flood attack the attacker repeatedly send SYN packets to every port on the target server, often using fake IP addresses. These packets appear legitimate to the server as it tries to establish communication with a SYN-ACK packet. This basically overloads the server and it cannot establish communication due to the large amount of requests occurring.

  • A TCP flooding attack occurs by an attacker establishing a worm inside the victim system. This worm repeatedly attempts to connect to the system via SYN-ACK packets. These appear legeitimate as they come from within the host system and therefore bypass protection like firewalls and IPSec. This constant connections overload the systems resources causing it to reach capacity, and not be able to accept any legitimate connections.

Explanation

Question 27 of 52

1

If the server does not allocate any resource to maintain the connections during the TCP
handshake, will the attack still be successful?

Select one of the following:

  • True
  • False

Explanation

Question 28 of 52

1

Domain Validated Certificates have to be verified offline?

Select one of the following:

  • True
  • False

Explanation

Question 29 of 52

1

If Alice wants to use PGP, she is required to egister at a CA to get a certificate?

Select one of the following:

  • True
  • False

Explanation

Question 30 of 52

1

In IPSec, transport mode provides protection to the entire IP packet?

Select one of the following:

  • True
  • False

Explanation

Question 31 of 52

1

Attack surfaces in networks include both physical and wireless communication channels?

Select one of the following:

  • True
  • False

Explanation

Question 32 of 52

1

If a certificate of a CA is self-signed, such a CA cannot be the root CA.

Select one of the following:

  • True
  • False

Explanation

Question 33 of 52

1

Which statement(s) is/are true about the TOR network?

Select one of the following:

  • If there are 5 intermediate Tor routers between the user and web server, the middle one knows neither the user IP nor the server IP.

  • For per communication session, each TOR router will use its own key to encrypt the message.

  • Tor can hide the IP address of the users from all intermediate Tor routers.

Explanation

Question 34 of 52

1

Which statement(s) is/are true about the secure key distribution?

Select one of the following:

  • Alice can use public key of Bob to encrypt the private message encryption key in the presence of MITM attackers.

  • A security association is defined by the HMAC output that’s computed on the packets

  • Two parties can run the DH key exchange protocol to generate the key after mutual verification of their identities.

Explanation

Question 35 of 52

1

Which way(s) is/are not trusted for obtaining the CA’s certificate?

Select one of the following:

  • The certificate is installed on your mobile phone’s operating system.

  • The certificate is loaded from a USB, which is mailed from the CA service provider.

  • The certificate is sent by a chat bot via an end-to-end encrypted messaging app.

Explanation

Question 36 of 52

1

Which statement(s) is/are not true regarding the security of IPSec-based (Tunnel Mode) VPN service?

Select one of the following:

  • IPSec-based VPN reveals the IP address of the sender host.

  • IPSec-based VPN prevents from traffic analysis.

  • IPSec-based VPN reveals the IP addresses of the gateways which establish the tunnel.

Explanation

Question 37 of 52

1

In PGP, the signature of message is generated before compression. Which statement(s) is/are the reason of doing this?

Select one of the following:

  • The signature cannot be applied on the compressed message.

  • The compression algorithm might not be deterministic.

  • The compression algorithm can reduce the redundancy of the message.

Explanation

Question 38 of 52

1

Why is the checksum in the header field of an IP packet insufficient for offering security?

Select one of the following:

  • Checksum is not encrypted

  • Checksum only checks some parts of the payload

  • Checksum itself can be changed and forged

Explanation

Question 39 of 52

1

Which statement/s is(are) not true about the Anti-Replay service of IPSec?

Select one of the following:

  • The sequence number of packets cannot be a negative number.

  • The sliding window will be moved based on a time parameter defined in advance, e.g., after 1 minute, the window is advanced.

  • The receiver will accept the packets with a sequence number within the current sliding window and mark them as “received”.

Explanation

Question 40 of 52

1

Which of the following is/are a service provided by PGP email encryption?

Select one of the following:

  • Allow content filtering on encrypted emails

  • Ensure the confidentiality of all email fields

  • Provide a distributed key management service

Explanation

Question 41 of 52

1

What is the ultimate goal of CONFidentiality in network applications?

Select one of the following:

  • The encryption and decryption key remains secret

  • Both parties in a connection are confident about the security of their communication

  • The message m exchanged between two parties remains secret during the transmission

Explanation

Question 42 of 52

1

It is sufficient to rely solely on transport layer security?

Select one of the following:

  • True
  • False

Explanation

Question 43 of 52

1

What is a countermeasure to TCP flooding attacks?

Select one or more of the following:

  • Firewalls

  • Recycle list of half-opened connections

  • SYN cookies

  • Allocate backlog memory to a large amount

  • Encryption of IP header

  • Sliding window replay mechanism

Explanation

Question 44 of 52

1

We generate a signature prior to compression so the signature does not depend on the compression algorithm.

Select one of the following:

  • True
  • False

Explanation

Question 45 of 52

1

Why does compression take place before encryption in PGP?

Select one of the following:

  • Compression takes place before encryption to reduce the size of the message.

  • Compression is done prior to encryption to reduce redundancy. Compressing after encryption would mean the encryption would also have to be compressed, which would lower efficiency and speed.

  • Compression is done prior to encryption to increase the validity of the encryption.

Explanation

Question 46 of 52

1

What are some limitations of PGP?

Select one or more of the following:

  • Misuse

  • Leakage

  • No forward secrecy

  • Lack of non-repudiation and authentication in compromised scenarios

  • Lack of encryption

  • Headers can be targeted by hackers to reveal IP addresses

Explanation

Question 47 of 52

1

Email service providers (eg. gmail) do not deploy end-to-end email encryption because it is too expensive?

Select one of the following:

  • True
  • False

Explanation

Question 48 of 52

1

TLS (transport layer security) hides the IP address of clients?

Select one of the following:

  • True
  • False

Explanation

Question 49 of 52

1

What are some services offered by IPSec?

Select one or more of the following:

  • Messages Authentication (Integrity)

  • Key Management (Authenticity)

  • Anti-replay (Availability)

Explanation

Question 50 of 52

1

The Internet Key Exchange (IKE) used in IPSec is based off of the Diffie-Hellman key exchange method?

Select one of the following:

  • True
  • False

Explanation

Question 51 of 52

1

What is true about ESP tunnel mode?

Select one of the following:

  • ESP tunnel mode encrypts the IP paylod but not the IP header

  • ESP tunnel mode allows for traffic analysis

  • ESP tunnel mode disables traffic analysis

  • ESP tunnel mode authenticates the IP payloud and selected portions of the IP header

Explanation

Question 52 of 52

1

What is true about AH transport mode?

Select one of the following:

  • Authenticates entire IP packet

  • Encrypts IP payload

  • Encypts entire IP packet

  • Authenticates IP payloud and selected portions of the IP header

Explanation

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