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Latest and Most Accurate CompTIA SY0-401 Dumps Exam Questions and Answers:

Version: 39.0
Question: 21

An achievement in providing worldwide Internet security was the signing of certificates associated with which of the following protocols?

A. TCP/IP
B. SSL
C. SCP
D. SSH

Answer: B

Explanation:
SSL (Secure Sockets Layer) is used for establishing an encrypted link between two computers, typically a web server and a browser. SSL is used to enable sensitive information such as login credentials and credit card numbers to be transmitted securely.
Incorrect Answers:
A: TCP/IP (Transmission Control Protocol/Internet Protocol) is a layered suite of protocols used to enable network communications between computers. All communications over the Internet between a Web browser and a Web server use TCP/IP. HTTP and SSL run in the Application layer of the TCP/IP protocol suite. TCP/IP itself does not use digitally signed certificates.
C: SCP (Secure Copy) uses SSH (Secure Shell) to copy files between computers using a secure encrypted connection. SSH uses public and private keys in a similar way to SSL to encrypt the connection, however SCP/SSH are not the protocols used to provide the “worldwide Internet security” that this question is asking about.
D: SSH (Secure Shell) is commonly used to log into a remote machine and execute commands over a secure encrypted connection. SSH uses public and private keys in a similar way to SSL to encrypt the connection. However SSH is not the protocol used to provide the “worldwide Internet security” that this question is asking about.
References:
https://www.digicert.com/ssl.htm

Question: 22

Which of the following is the MOST secure protocol to transfer files?

A. FTP
B. FTPS
C. SSH
D. TELNET

Answer: B

Explanation:
FTPS refers to FTP Secure, or FTP SSL. It is a secure variation of File Transfer Protocol (FTP).
Incorrect Answers:
A: FTP traffic is vulnerable to packet sniffing and other forms of eavesdropping. It is, therefore, not secure.
C: SSH allows a user to run commands on a machine’s command prompt without being near the machine physically.
D: TELNET, by default, does not encrypt any data sent over the connection, and so it is often practical to eavesdrop on the communications and use the password later for malicious purposes. It is, therefore, not secure.
References:
Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, pp. 42, 46, 49, 51

Question: 23

The security administrator at ABC company received the following log information from an external party:
10:45:01 EST, SRC 10.4.3.7:3056, DST 8.4.2.1:80, ALERT, Directory traversal
10:45:02 EST, SRC 10.4.3.7:3057, DST 8.4.2.1:80, ALERT, Account brute force
10:45:03 EST, SRC 10.4.3.7:3058, DST 8.4.2.1:80, ALERT, Port scan
The external party is reporting attacks coming from abc-company.com. Which of the following is the reason the ABC company’s security administrator is unable to determine the origin of the attack?

A. A NIDS was used in place of a NIPS.
B. The log is not in UTC.
C. The external party uses a firewall.
D. ABC company uses PAT.

Answer: D

Explanation:
PAT would ensure that computers on ABC’s LAN translate to the same IP address, but with a different port number assignment. The log information shows the IP address, not the port number, making it impossible to pin point the exact source.
Incorrect Answers:
A: A network-based IDS (NIDS) watches network traffic in real time. It’s reliable for detecting network-focused attacks, such as bandwidth-based DoS attacks. This will not have any bearing on the security administrator at ABC Company finding the root of the attack.
B: UTC is the abbreviation for Coordinated Universal Time, which is the primary time standard by which the world regulates clocks and time. The time in the log is not the issue in this case.
C: Whether the external party uses a firewall or not will not have any bearing on the security administrator at ABC Company finding the root of the attack.
References:
http://www.webopedia.com/TERM/P/PAT.html
http://en.wikipedia.org/wiki/Intrusion_prevention_system
http://en.wikipedia.org/wiki/Coordinated_Universal_Time

Question: 24

Which of the following security devices can be replicated on a Linux based computer using IP tables to inspect and properly handle network based traffic?

A. Sniffer
B. Router
C. Firewall
D. Switch

Answer: C

Explanation:
Ip tables are a user-space application program that allows a system administrator to configure the tables provided by the Linux kernel firewall and the chains and rules it stores.
Incorrect Answers:
A: A sniffer is a tool used in the process of monitoring the data that is transmitted across a network.
B, D: A router is connected to two or more data lines from different networks, whereas a network switch is connected to data lines from one single network. These may include a firewall, but not by default.
References:
http://en.wikipedia.org/wiki/Iptables
Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis, 2014, p. 342
http://en.wikipedia.org/wiki/Router_(computing)

Question: 25

Which of the following firewall types inspects Ethernet traffic at the MOST levels of the OSI model?

A. Packet Filter Firewall
B. Stateful Firewall
C. Proxy Firewall
D. Application Firewall

Answer: B

Explanation:
Stateful inspections occur at all levels of the network.
Incorrect Answers:
A: Packet-filtering firewalls operate at the Network layer (Layer 3) and the Transport layer (Layer 4) of the Open Systems Interconnect (OSI) model.
C: The proxy function can occur at either the application level or the circuit level.
D: Application Firewalls operates at the Application layer (Layer7) of the OSI model.
References:
Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis, 2014, pp. 98-100
Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, p. 6

Question: 26

The Chief Information Security Officer (CISO) has mandated that all IT systems with credit card data be segregated from the main corporate network to prevent unauthorized access and that access to the IT systems should be logged. Which of the following would BEST meet the CISO’s requirements?

A. Sniffers
B. NIDS
C. Firewalls
D. Web proxies
E. Layer 2 switches

Answer: C

Explanation:
The basic purpose of a firewall is to isolate one network from another.
Incorrect Answers:
A: The terms protocol analyzer and packet sniffer are interchangeable. They refer to the tools used in the process of monitoring the data that is transmitted across a network.
B: A network-based IDS (NIDS) watches network traffic in real time. It’s reliable for detecting network-focused attacks, such as bandwidth-based DoS attacks.
D: Web proxies are used to forward HTTP requests.
E: Layer 2 switching uses the media access control address (MAC address) from the host’s network interface cards (NICs) to decide where to forward frames. Layer 2 switching is hardware based, which means switches use application-specific integrated circuit (ASICs) to build and maintain filter tables (also known as MAC address tables or CAM tables).
References:
Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis, 2014, p. 342
http://en.wikipedia.org/wiki/Intrusion_prevention_system
http://en.wikipedia.org/wiki/LAN_switching
http://en.wikipedia.org/wiki/Proxy_server#Web_proxy_servers

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