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Practice exam questions for FIT3031 Network Security Exam

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FIT3031 - Network Security Exam Practice

Frage 1 von 52

1

Which of the following algorithm is a symmetric encryption algorithm?

Wähle eine der folgenden:

  • RSA

  • Diffie-Hellman

  • SHA-256

  • DES

Erklärung

Frage 2 von 52

1

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

Wähle eine der folgenden:

  • Replay

  • Modification of Message

  • Denial of Service

  • All of the above

Erklärung

Frage 3 von 52

1

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

Wähle eine der folgenden:

  • 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

Erklärung

Frage 4 von 52

1

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

Wähle eine der folgenden:

  • SNOW 3G

  • AES

  • 3DES

  • ZUC

Erklärung

Frage 5 von 52

1

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

Wähle eine der folgenden:

  • Key distribution

  • Integrity

  • Efficiency

  • All of the above

Erklärung

Frage 6 von 52

1

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

Wähle eine der folgenden:

  • 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.

Erklärung

Frage 7 von 52

1

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

Wähle eine der folgenden:

  • Factorisation

  • Subset sum

  • Discrete logarithm (DL)

  • Learning with errors (LWE)

Erklärung

Frage 8 von 52

1

IPSec is used to secure the __________ layer.

Wähle eine der folgenden:

  • Application

  • TCP

  • Network Layer (IP)

  • Physical

Erklärung

Frage 9 von 52

1

X.509 is a standard of __________ .

Wähle eine der folgenden:

  • Digital Signature

  • Email Security

  • Wireless LAN Security

  • Digital Security

Erklärung

Frage 10 von 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

Wähle eine der folgenden:

  • Both A and B

  • Both B and C

  • Both A and C

  • All of the above

Erklärung

Frage 11 von 52

1

SSH is an encrypted version of ______

Wähle eine der folgenden:

  • MIME

  • HTTP

  • TELNET

  • Internet Protocol

Erklärung

Frage 12 von 52

1

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

Wähle eine der folgenden:

  • Man-in-the-middle

  • SQL Injection

  • Denial of Service

  • Side Channel

Erklärung

Frage 13 von 52

1

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

Wähle eine der folgenden:

  • 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

Erklärung

Frage 14 von 52

1

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

Wähle eine der folgenden:

  • 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

Erklärung

Frage 15 von 52

1

What are two security services provided by signcryption?

Wähle eine der folgenden:

  • Confidentiality and Integrity

  • Confidentiality and Availability

  • Integrity and Availability

Erklärung

Frage 16 von 52

1

What is meant by "Access Control"?

Wähle eine der folgenden:

  • 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

Erklärung

Frage 17 von 52

1

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

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 18 von 52

1

IPSec encapsulation mode provides protection to the entire IP packet.

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 19 von 52

1

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

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 20 von 52

1

DDoS attacks cannot be launched at the application layer.

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 21 von 52

1

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

Wähle eine der folgenden:

  • Wireless security

  • Physical security

  • Human input errors

Erklärung

Frage 22 von 52

1

Ciphertext-only capability means that: ______________.

Wähle eine der folgenden:

  • Only decryption can be performed on the ciphertexts

  • The adversary can only access to the ciphertexts

  • The adversary can only decrypt chosen ciphertexts

Erklärung

Frage 23 von 52

1

PGP provides confidentiality through the use of ____________________.

Wähle eine der folgenden:

  • Symmetric block encryption

  • Radix-64

  • Digital signatures

Erklärung

Frage 24 von 52

1

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

Wähle eine der folgenden:

  • Cipher mode

  • Transport mode

  • Tunnel mode

Erklärung

Frage 25 von 52

1

Which is FALSE regarding VPN?

Wähle eine der folgenden:

  • 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.

Erklärung

Frage 26 von 52

1

How does a TCP flooding attack occur?

Wähle eine der folgenden:

  • 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.

Erklärung

Frage 27 von 52

1

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

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 28 von 52

1

Domain Validated Certificates have to be verified offline?

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 29 von 52

1

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

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 30 von 52

1

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

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 31 von 52

1

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

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 32 von 52

1

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

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 33 von 52

1

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

Wähle eine der folgenden:

  • 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.

Erklärung

Frage 34 von 52

1

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

Wähle eine der folgenden:

  • 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.

Erklärung

Frage 35 von 52

1

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

Wähle eine der folgenden:

  • 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.

Erklärung

Frage 36 von 52

1

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

Wähle eine der folgenden:

  • 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.

Erklärung

Frage 37 von 52

1

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

Wähle eine der folgenden:

  • 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.

Erklärung

Frage 38 von 52

1

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

Wähle eine der folgenden:

  • Checksum is not encrypted

  • Checksum only checks some parts of the payload

  • Checksum itself can be changed and forged

Erklärung

Frage 39 von 52

1

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

Wähle eine der folgenden:

  • 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”.

Erklärung

Frage 40 von 52

1

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

Wähle eine der folgenden:

  • Allow content filtering on encrypted emails

  • Ensure the confidentiality of all email fields

  • Provide a distributed key management service

Erklärung

Frage 41 von 52

1

What is the ultimate goal of CONFidentiality in network applications?

Wähle eine der folgenden:

  • 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

Erklärung

Frage 42 von 52

1

It is sufficient to rely solely on transport layer security?

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 43 von 52

1

What is a countermeasure to TCP flooding attacks?

Wähle eine oder mehr der folgenden:

  • Firewalls

  • Recycle list of half-opened connections

  • SYN cookies

  • Allocate backlog memory to a large amount

  • Encryption of IP header

  • Sliding window replay mechanism

Erklärung

Frage 44 von 52

1

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

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 45 von 52

1

Why does compression take place before encryption in PGP?

Wähle eine der folgenden:

  • 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.

Erklärung

Frage 46 von 52

1

What are some limitations of PGP?

Wähle eine oder mehr der folgenden:

  • 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

Erklärung

Frage 47 von 52

1

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

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 48 von 52

1

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

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 49 von 52

1

What are some services offered by IPSec?

Wähle eine oder mehr der folgenden:

  • Messages Authentication (Integrity)

  • Key Management (Authenticity)

  • Anti-replay (Availability)

Erklärung

Frage 50 von 52

1

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

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 51 von 52

1

What is true about ESP tunnel mode?

Wähle eine der folgenden:

  • 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

Erklärung

Frage 52 von 52

1

What is true about AH transport mode?

Wähle eine der folgenden:

  • Authenticates entire IP packet

  • Encrypts IP payload

  • Encypts entire IP packet

  • Authenticates IP payloud and selected portions of the IP header

Erklärung