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FIT3031 - Network Security Exam Practice

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Practice exam questions for FIT3031 Network Security Exam
Nicholas Bagnall
Quiz por Nicholas Bagnall, atualizado more than 1 year ago
Nicholas Bagnall
Criado por Nicholas Bagnall mais de 1 ano atrás
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Resumo de Recurso

Questão 1

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

Questão 2

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

Questão 3

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

Questão 4

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

Questão 5

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

Questão 6

Questão
Which of the following statement regarding SHA-1 is true?
Responda
  • 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.

Questão 7

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

Questão 8

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

Questão 9

Questão
X.509 is a standard of __________ .
Responda
  • Digital Signature
  • Email Security
  • Wireless LAN Security
  • Digital Security

Questão 10

Questão
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
Responda
  • Both A and B
  • Both B and C
  • Both A and C
  • All of the above

Questão 11

Questão
SSH is an encrypted version of ______
Responda
  • MIME
  • HTTP
  • TELNET
  • Internet Protocol

Questão 12

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

Questão 13

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

Questão 14

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

Questão 15

Questão
What are two security services provided by signcryption?
Responda
  • Confidentiality and Integrity
  • Confidentiality and Availability
  • Integrity and Availability

Questão 16

Questão
What is meant by "Access Control"?
Responda
  • 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

Questão 17

Questão
A loss of integrity is unauthorised modification of data during the communication.
Responda
  • True
  • False

Questão 18

Questão
IPSec encapsulation mode provides protection to the entire IP packet.
Responda
  • True
  • False

Questão 19

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

Questão 20

Questão
DDoS attacks cannot be launched at the application layer.
Responda
  • True
  • False

Questão 21

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

Questão 22

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

Questão 23

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

Questão 24

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

Questão 25

Questão
Which is FALSE regarding VPN?
Responda
  • 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.

Questão 26

Questão
How does a TCP flooding attack occur?
Responda
  • 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.

Questão 27

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

Questão 28

Questão
Domain Validated Certificates have to be verified offline?
Responda
  • True
  • False

Questão 29

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

Questão 30

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

Questão 31

Questão
Attack surfaces in networks include both physical and wireless communication channels?
Responda
  • True
  • False

Questão 32

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

Questão 33

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

Questão 34

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

Questão 35

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

Questão 36

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

Questão 37

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

Questão 38

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

Questão 39

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

Questão 40

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

Questão 41

Questão
What is the ultimate goal of CONFidentiality in network applications?
Responda
  • 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

Questão 42

Questão
It is sufficient to rely solely on transport layer security?
Responda
  • True
  • False

Questão 43

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

Questão 44

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

Questão 45

Questão
Why does compression take place before encryption in PGP?
Responda
  • 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.

Questão 46

Questão
What are some limitations of PGP?
Responda
  • 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

Questão 47

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

Questão 48

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

Questão 49

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

Questão 50

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

Questão 51

Questão
What is true about ESP tunnel mode?
Responda
  • 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

Questão 52

Questão
What is true about AH transport mode?
Responda
  • 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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