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FIT3031 - Network Security Exam Practice

Description

Practice exam questions for FIT3031 Network Security Exam
Nicholas Bagnall
Quiz by Nicholas Bagnall, updated more than 1 year ago
Nicholas Bagnall
Created by Nicholas Bagnall about 2 years ago
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Resource summary

Question 1

Question
Which of the following algorithm is a symmetric encryption algorithm?
Answer
  • RSA
  • Diffie-Hellman
  • SHA-256
  • DES

Question 2

Question
Which of the following attacks are active attacks? - Replay - Modification of Message - Denial of Service
Answer
  • Replay
  • Modification of Message
  • Denial of Service
  • All of the above

Question 3

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

Question 4

Question
Which of the following encryption algorithm is NOT used in 4G LTE?
Answer
  • SNOW 3G
  • AES
  • 3DES
  • ZUC

Question 5

Question
Asymmetric encryption can solve the __________ problem(s) of symmetric encryption.
Answer
  • Key distribution
  • Integrity
  • Efficiency
  • All of the above

Question 6

Question
Which of the following statement regarding SHA-1 is true?
Answer
  • 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.

Question 7

Question
The security of Diffie-Hellman Algorithm relies on the __________ problem.
Answer
  • Factorisation
  • Subset sum
  • Discrete logarithm (DL)
  • Learning with errors (LWE)

Question 8

Question
IPSec is used to secure the __________ layer.
Answer
  • Application
  • TCP
  • Network Layer (IP)
  • Physical

Question 9

Question
X.509 is a standard of __________ .
Answer
  • Digital Signature
  • Email Security
  • Wireless LAN Security
  • Digital Security

Question 10

Question
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
Answer
  • Both A and B
  • Both B and C
  • Both A and C
  • All of the above

Question 11

Question
SSH is an encrypted version of ______
Answer
  • MIME
  • HTTP
  • TELNET
  • Internet Protocol

Question 12

Question
Cloning of 4G SIM card can be done using __________ attack.
Answer
  • Man-in-the-middle
  • SQL Injection
  • Denial of Service
  • Side Channel

Question 13

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

Question 14

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

Question 15

Question
What are two security services provided by signcryption?
Answer
  • Confidentiality and Integrity
  • Confidentiality and Availability
  • Integrity and Availability

Question 16

Question
What is meant by "Access Control"?
Answer
  • 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

Question 17

Question
A loss of integrity is unauthorised modification of data during the communication.
Answer
  • True
  • False

Question 18

Question
IPSec encapsulation mode provides protection to the entire IP packet.
Answer
  • True
  • False

Question 19

Question
Machine learning based intrusion detection systems are likely to produce false positives during traffic analysis.
Answer
  • True
  • False

Question 20

Question
DDoS attacks cannot be launched at the application layer.
Answer
  • True
  • False

Question 21

Question
Which of the following is an example aspect of network security?
Answer
  • Wireless security
  • Physical security
  • Human input errors

Question 22

Question
Ciphertext-only capability means that: ______________.
Answer
  • Only decryption can be performed on the ciphertexts
  • The adversary can only access to the ciphertexts
  • The adversary can only decrypt chosen ciphertexts

Question 23

Question
PGP provides confidentiality through the use of ____________________.
Answer
  • Symmetric block encryption
  • Radix-64
  • Digital signatures

Question 24

Question
In IPSec, authentication NOT applied to the entire original IP packet is ______________.
Answer
  • Cipher mode
  • Transport mode
  • Tunnel mode

Question 25

Question
Which is FALSE regarding VPN?
Answer
  • 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.

Question 26

Question
How does a TCP flooding attack occur?
Answer
  • 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.

Question 27

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

Question 28

Question
Domain Validated Certificates have to be verified offline?
Answer
  • True
  • False

Question 29

Question
If Alice wants to use PGP, she is required to egister at a CA to get a certificate?
Answer
  • True
  • False

Question 30

Question
In IPSec, transport mode provides protection to the entire IP packet?
Answer
  • True
  • False

Question 31

Question
Attack surfaces in networks include both physical and wireless communication channels?
Answer
  • True
  • False

Question 32

Question
If a certificate of a CA is self-signed, such a CA cannot be the root CA.
Answer
  • True
  • False

Question 33

Question
Which statement(s) is/are true about the TOR network?
Answer
  • 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.

Question 34

Question
Which statement(s) is/are true about the secure key distribution?
Answer
  • 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.

Question 35

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

Question 36

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

Question 37

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

Question 38

Question
Why is the checksum in the header field of an IP packet insufficient for offering security?
Answer
  • Checksum is not encrypted
  • Checksum only checks some parts of the payload
  • Checksum itself can be changed and forged

Question 39

Question
Which statement/s is(are) not true about the Anti-Replay service of IPSec?
Answer
  • 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”.

Question 40

Question
Which of the following is/are a service provided by PGP email encryption?
Answer
  • Allow content filtering on encrypted emails
  • Ensure the confidentiality of all email fields
  • Provide a distributed key management service

Question 41

Question
What is the ultimate goal of CONFidentiality in network applications?
Answer
  • 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

Question 42

Question
It is sufficient to rely solely on transport layer security?
Answer
  • True
  • False

Question 43

Question
What is a countermeasure to TCP flooding attacks?
Answer
  • Firewalls
  • Recycle list of half-opened connections
  • SYN cookies
  • Allocate backlog memory to a large amount
  • Encryption of IP header
  • Sliding window replay mechanism

Question 44

Question
We generate a signature prior to compression so the signature does not depend on the compression algorithm.
Answer
  • True
  • False

Question 45

Question
Why does compression take place before encryption in PGP?
Answer
  • 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.

Question 46

Question
What are some limitations of PGP?
Answer
  • 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

Question 47

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

Question 48

Question
TLS (transport layer security) hides the IP address of clients?
Answer
  • True
  • False

Question 49

Question
What are some services offered by IPSec?
Answer
  • Messages Authentication (Integrity)
  • Key Management (Authenticity)
  • Anti-replay (Availability)

Question 50

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

Question 51

Question
What is true about ESP tunnel mode?
Answer
  • 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

Question 52

Question
What is true about AH transport mode?
Answer
  • Authenticates entire IP packet
  • Encrypts IP payload
  • Encypts entire IP packet
  • Authenticates IP payloud and selected portions of the IP header
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