38123230
Descripción
Test por Nicholas Bagnall, actualizado hace más de 1 año
|
Creado por Nicholas Bagnall
hace alrededor de 2 años
|
|
Pregunta 1
Pregunta
Which of the following algorithm is a symmetric encryption algorithm?
Respuesta
-
RSA
-
Diffie-Hellman
-
SHA-256
-
DES
Pregunta 2
Pregunta
Which of the following attacks are active attacks?
- Replay
- Modification of Message
- Denial of Service
Respuesta
-
Replay
-
Modification of Message
-
Denial of Service
-
All of the above
Pregunta 3
Pregunta
Which of the following statement(s) regarding symmetric encryption is/are not true?
Respuesta
-
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
Pregunta 4
Pregunta
Which of the following encryption algorithm is NOT used in 4G LTE?
Respuesta
-
SNOW 3G
-
AES
-
3DES
-
ZUC
Pregunta 5
Pregunta
Asymmetric encryption can solve the __________ problem(s) of symmetric encryption.
Respuesta
-
Key distribution
-
Integrity
-
Efficiency
-
All of the above
Pregunta 6
Pregunta
Which of the following statement regarding SHA-1 is true?
Respuesta
-
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.
Pregunta 7
Pregunta
The security of Diffie-Hellman Algorithm relies on the __________ problem.
Respuesta
-
Factorisation
-
Subset sum
-
Discrete logarithm (DL)
-
Learning with errors (LWE)
Pregunta 8
Pregunta
IPSec is used to secure the __________ layer.
Respuesta
-
Application
-
TCP
-
Network Layer (IP)
-
Physical
Pregunta 9
Pregunta
X.509 is a standard of __________ .
Respuesta
-
Digital Signature
-
Email Security
-
Wireless LAN Security
-
Digital Security
Pregunta 10
Pregunta
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
Respuesta
-
Both A and B
-
Both B and C
-
Both A and C
-
All of the above
Pregunta 11
Pregunta
SSH is an encrypted version of ______
Respuesta
-
MIME
-
HTTP
-
TELNET
-
Internet Protocol
Pregunta 12
Pregunta
Cloning of 4G SIM card can be done using __________ attack.
Respuesta
-
Man-in-the-middle
-
SQL Injection
-
Denial of Service
-
Side Channel
Pregunta 13
Pregunta
Which of the following statement(s) describe(s) correctly the difference(s) between a virus and a worm?
Respuesta
-
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
Pregunta 14
Pregunta
Which of the following is/are the limitation(s) of a firewall?
Respuesta
-
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
Pregunta 15
Pregunta
What are two security services provided by signcryption?
Respuesta
-
Confidentiality and Integrity
-
Confidentiality and Availability
-
Integrity and Availability
Pregunta 16
Pregunta
What is meant by "Access Control"?
Respuesta
-
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
Pregunta 17
Pregunta
A loss of integrity is unauthorised modification of data during the communication.
Respuesta
- True
- False
Pregunta 18
Pregunta
IPSec encapsulation mode provides protection to the entire IP packet.
Respuesta
- True
- False
Pregunta 19
Pregunta
Machine learning based intrusion detection systems are likely to produce false positives
during traffic analysis.
Respuesta
- True
- False
Pregunta 20
Pregunta
DDoS attacks cannot be launched at the application layer.
Respuesta
- True
- False
Pregunta 21
Pregunta
Which of the following is an example aspect of network security?
Respuesta
-
Wireless security
-
Physical security
-
Human input errors
Pregunta 22
Pregunta
Ciphertext-only capability means that: ______________.
Respuesta
-
Only decryption can be performed on the ciphertexts
-
The adversary can only access to the ciphertexts
-
The adversary can only decrypt chosen ciphertexts
Pregunta 23
Pregunta
PGP provides confidentiality through the use of ____________________.
Respuesta
-
Symmetric block encryption
-
Radix-64
-
Digital signatures
Pregunta 24
Pregunta
In IPSec, authentication NOT applied to the entire original IP packet is ______________.
Respuesta
-
Cipher mode
-
Transport mode
-
Tunnel mode
Pregunta 25
Pregunta
Which is FALSE regarding VPN?
Respuesta
-
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.
Pregunta 26
Pregunta
How does a TCP flooding attack occur?
Respuesta
-
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.
Pregunta 27
Pregunta
If the server does not allocate any resource to maintain the connections during the TCP
handshake, will the attack still be successful?
Respuesta
- True
- False
Pregunta 28
Pregunta
Domain Validated Certificates have to be verified offline?
Respuesta
- True
- False
Pregunta 29
Pregunta
If Alice wants to use PGP, she is required to egister at a CA to get a certificate?
Respuesta
- True
- False
Pregunta 30
Pregunta
In IPSec, transport mode provides protection to the entire IP packet?
Respuesta
- True
- False
Pregunta 31
Pregunta
Attack surfaces in networks include both physical and wireless communication channels?
Respuesta
- True
- False
Pregunta 32
Pregunta
If a certificate of a CA is self-signed, such a CA cannot be the root CA.
Respuesta
- True
- False
Pregunta 33
Pregunta
Which statement(s) is/are true about the TOR network?
Respuesta
-
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.
Pregunta 34
Pregunta
Which statement(s) is/are true about the secure key distribution?
Respuesta
-
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.
Pregunta 35
Pregunta
Which way(s) is/are not trusted for obtaining the CA’s certificate?
Respuesta
-
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.
Pregunta 36
Pregunta
Which statement(s) is/are not true regarding the security of IPSec-based (Tunnel Mode) VPN service?
Respuesta
-
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.
Pregunta 37
Pregunta
In PGP, the signature of message is generated before compression. Which statement(s) is/are the reason of doing this?
Respuesta
-
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.
Pregunta 38
Pregunta
Why is the checksum in the header field of an IP packet insufficient for offering security?
Respuesta
-
Checksum is not encrypted
-
Checksum only checks some parts of the payload
-
Checksum itself can be changed and forged
Pregunta 39
Pregunta
Which statement/s is(are) not true about the Anti-Replay service of IPSec?
Respuesta
-
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”.
Pregunta 40
Pregunta
Which of the following is/are a service provided by PGP email encryption?
Respuesta
-
Allow content filtering on encrypted emails
-
Ensure the confidentiality of all email fields
-
Provide a distributed key management service
Pregunta 41
Pregunta
What is the ultimate goal of CONFidentiality in network applications?
Respuesta
-
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
Pregunta 42
Pregunta
It is sufficient to rely solely on transport layer security?
Respuesta
- True
- False
Pregunta 43
Pregunta
What is a countermeasure to TCP flooding attacks?
Respuesta
-
Firewalls
-
Recycle list of half-opened connections
-
SYN cookies
-
Allocate backlog memory to a large amount
-
Encryption of IP header
-
Sliding window replay mechanism
Pregunta 44
Pregunta
We generate a signature prior to compression so the signature does not depend on the compression algorithm.
Respuesta
- True
- False
Pregunta 45
Pregunta
Why does compression take place before encryption in PGP?
Respuesta
-
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.
Pregunta 46
Pregunta
What are some limitations of PGP?
Respuesta
-
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
Pregunta 47
Pregunta
Email service providers (eg. gmail) do not deploy end-to-end email encryption because it is too expensive?
Respuesta
- True
- False
Pregunta 48
Pregunta
TLS (transport layer security) hides the IP address of clients?
Respuesta
- True
- False
Pregunta 49
Pregunta
What are some services offered by IPSec?
Respuesta
-
Messages Authentication (Integrity)
-
Key Management (Authenticity)
-
Anti-replay (Availability)
Pregunta 50
Pregunta
The Internet Key Exchange (IKE) used in IPSec is based off of the Diffie-Hellman key exchange method?
Respuesta
- True
- False
Pregunta 51
Pregunta
What is true about ESP tunnel mode?
Respuesta
-
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
Pregunta 52
Pregunta
What is true about AH transport mode?
Respuesta
-
Authenticates entire IP packet
-
Encrypts IP payload
-
Encypts entire IP packet
-
Authenticates IP payloud and selected portions of the IP header
¿Quieres crear tus propios Tests gratis con GoConqr? Más información.