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SY0-401.examcollection.premium.exam.1752q
Number: SY0-401
Passing Score: 800
Time Limit: 120 min
File Version: 34.0
SY0-401
CompTIA Security+ Certification
Version 34.0
Sections
1. Network Security
2. Compliance and Operational Security
3. Threats and Vulnerabilities
4. Application, Data and Host Security
5. Access Control and Identity Management
6. Cryptography
7. Mixed Questions
Exam A
QUESTION 1
Sara, the security administrator, must configure the corporate firewall to allow all public IP addresses on the
internal interface of the firewall to be translated to one public IP address on the external interface of the same
firewall. Which of the following should Sara configure?
A. PAT
B. NAP
C. DNAT
D. NAC
Correct Answer: A
Section: Network Security
Explanation
Explanation/Reference:
Explanation:
Port Address Translation (PAT), is an extension to network address translation (NAT) that permits multiple
devices on a local area network (LAN) to be mapped to a single public IP address. The goal of PAT is to
conserve IP addresses.
Most home networks use PAT. In such a scenario, the Internet Service Provider (ISP) assigns a single IP
address to the home network’s router. When Computer X logs on the Internet, the router assigns the client a
port number, which is appended to the internal IP address. This, in effect, gives Computer X a unique address.
If Computer Z logs on the Internet at the same time, the router assigns it the same local IP address with a
different port number. Although both computers are sharing the same public IP address and accessing the
Internet at the same time, the router knows exactly which computer to send specific packets to because each
computer has a unique internal address.
Incorrect Answers:
B: NAP is a Microsoft technology for controlling network access of a computer host based on system health of
the host.
C: Destination network address translation (DNAT) is a technique for transparently changing the destination IP
address of an end route packet and performing the inverse function for any replies. Any router situated between
two endpoints can perform this transformation of the packet. DNAT is commonly used to publish a service
located in a private network on a publicly accessible IP address. This use of DNAT is also called port
forwarding. DNAT does not allow for many internal devices to share one public IP address.
D: NAC is an approach to computer network security that attempts to unify endpoint security technology (such
as antivirus, host intrusion prevention, and vulnerability assessment), user or system authentication and
network security enforcement.
References:
http://searchnetworking.techtarget.com/definition/Port-Address-Translation-PAT
http://en.wikipedia.org/wiki/Network_Access_Protection
http://en.wikipedia.org/wiki/Network_address_translation#DNAT
http://en.wikipedia.org/wiki/Network_Access_Control
QUESTION 2
Which of the following devices is MOST likely being used when processing the following?
1 PERMIT IP ANY ANY EQ 80
2 DENY IP ANY ANY
A. Firewall
B. NIPS
C. Load balancer
D. URL filter
Correct Answer: A
Section: Network Security
Explanation
Explanation/Reference:
Explanation:
Firewalls, routers, and even switches can use ACLs as a method of security management. An access control
list has a deny ip any any implicitly at the end of any access control list. ACLs deny by default and allow by
exception.
Incorrect Answers:
B: Network-based intrusion prevention system (NIPS) monitors the entire network for suspicious traffic by
analyzing protocol activity.
C: A load balancer is used to distribute network traffic load across several network links or network devices.
D: A URL filter is used to block URLs (websites) to prevent users accessing the website.
References:
Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, pp. 10, 24
http://www.cisco.com/c/en/us/support/docs/security/ios-firewall/23602-confaccesslists.html
http://en.wikipedia.org/wiki/Intrusion_prevention_system
http://www.provision.ro/threat-management/web-application-security/url-filtering#pagei-1|pagep-1|
QUESTION 3
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.
Correct Answer: D
Section: Network Security
Explanation
Explanation/Reference:
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 4
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
Correct Answer: C
Section: Network Security
Explanation
Explanation/Reference:
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 5
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
Correct Answer: B
Section: Network Security
Explanation
Explanation/Reference:
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 6
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
Correct Answer: C
Section: Network Security
Explanation
Explanation/Reference:
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
QUESTION 7
Which of the following network design elements allows for many internal devices to share one public IP
address?
A. DNAT
B. PAT
C. DNS
D. DMZ
Correct Answer: B
Section: Network Security
Explanation
Explanation/Reference:
Explanation:
Port Address Translation (PAT), is an extension to network address translation (NAT) that permits multiple
devices on a local area network (LAN) to be mapped to a single public IP address. The goal of PAT is to
conserve IP addresses.
Most home networks use PAT. In such a scenario, the Internet Service Provider (ISP) assigns a single IP
address to the home network’s router. When Computer X logs on the Internet, the router assigns the client a
port number, which is appended to the internal IP address. This, in effect, gives Computer X a unique address.
If Computer Z logs on the Internet at the same time, the router assigns it the same local IP address with a
different port number. Although both computers are sharing the same public IP address and accessing the
Internet at the same time, the router knows exactly which computer to send specific packets to because each
computer has a unique internal address.
Incorrect Answers:
A: Destination network address translation (DNAT) is a technique for transparently changing the destination IP
address of an end route packet and performing the inverse function for any replies. Any router situated between
two endpoints can perform this transformation of the packet. DNAT is commonly used to publish a service
located in a private network on a publicly accessible IP address. This use of DNAT is also called port
forwarding. DNAT does not allow for many internal devices to share one public IP address.
C: DNS (Domain Name System) is a service used to translate hostnames or URLs to IP addresses. DNS does
not allow for many internal devices to share one public IP address.
D: A DMZ or demilitarized zone is a physical or logical subnetwork that contains and exposes an organization’s
external-facing services to a larger and untrusted network, usually the Internet. The purpose of a DMZ is to add
an additional layer of security to an organization’s local area network (LAN); an external network node only has
direct access to equipment in the DMZ, rather than any other part of the network. A DMZ does not allow for
many internal devices to share one public IP address.
References:
http://searchnetworking.techtarget.com/definition/Port-Address-Translation-PAT
http://en.wikipedia.org/wiki/Network_address_translation#DNAT
http://en.wikipedia.org/wiki/Domain_Name_System
http://en.wikipedia.org/wiki/DMZ_(computing)

QUESTION 8
Which of the following is a best practice when securing a switch from physical access?
A. Disable unnecessary accounts
B. Print baseline configuration
C. Enable access lists
D. Disable unused ports
Correct Answer: D
Section: Network Security
Explanation
Explanation/Reference:
Explanation:
Disabling unused switch ports a simple method many network administrators use to help secure their network
from unauthorized access.
All ports not in use should be disabled. Otherwise, they present an open door for an attacker to enter.
Incorrect Answers:
A: Disabling unnecessary accounts would only block those specific accounts.
B: A security baseline is a standardized minimal level of security that all systems in an organization must
comply with. Printing it would not secure the switch from physical access.
C: The purpose of an access list is to identify specifically who can enter a facility.
References:
http://orbit-computer-solutions.com/How-To-Configure-Switch-Security.php
Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis, 2014,
p. 60
Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, p. 207
QUESTION 9
Which of the following devices would be MOST useful to ensure availability when there are a large number of
requests to a certain website?
A. Protocol analyzer
B. Load balancer
C. VPN concentrator
D. Web security gateway
Correct Answer: B
Section: Network Security
Explanation
Explanation/Reference:
Explanation:
Load balancing refers to shifting a load from one device to another. A load balancer can be implemented as a
software or hardware solution, and it is usually associated with a device — a router, a firewall, NAT appliance,
and so on. In its most common implementation, a load balancer splits the traffic intended for a website into
individual requests that are then rotated to redundant servers as they become available.
Incorrect Answers:
A: The terms protocol analyzing and packet sniffing are interchangeable. They refer to the process of
monitoring the data that is transmitted across a network.
C: A VPN concentrator is a hardware device used to create remote access VPNs. The concentrator creates
encrypted tunnel sessions between hosts, and many use two-factor authentication for additional security.
D: One of the newest buzzwords is web security gateway, which can be thought of as a proxy server
(performing proxy and caching functions) with web protection software built in. Depending on the vendor, the
“web protection” can range from a standard virus scanner on incoming packets to monitoring outgoing user
traffic for red flags as well.
References:
Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis, 2014,
pp. 103, 104, 118
QUESTION 10
Pete, the system administrator, wishes to monitor and limit users’ access to external websites.
Which of the following would BEST address this?
A. Block all traffic on port 80.
B. Implement NIDS.
C. Use server load balancers.
D. Install a proxy server.
Correct Answer: D
Section: Network Security
Explanation
Explanation/Reference:
Explanation:
A proxy is a device that acts on behalf of other(s). In the interest of security, all internal user interaction with the
Internet should be controlled through a proxy server. The proxy server should automatically block known
malicious sites. The proxy server should cache often-accessed sites to improve performance.
Incorrect Answers:
A: A network-based IDS (NIDS) approach to IDS attaches the system to a point in the network where it can
monitor and report on all network traffic.
B: This would block all web traffic, as port 80 is used for World Wide Web.
C: In its most common implementation, a load balancer splits the traffic intended for a website into individual
requests that are then rotated to redundant servers as they become available.
References:
Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis, 2014,
pp. 98, 103, 111
QUESTION 11
Mike, a network administrator, has been asked to passively monitor network traffic to the company’s sales
websites. Which of the following would be BEST suited for this task?
A. HIDS
B. Firewall
C. NIPS
D. Spam filter
Correct Answer: C
Section: Network Security
Explanation
Explanation/Reference:
Explanation:
Network-based intrusion prevention system (NIPS) monitors the entire network for suspicious traffic by
analyzing protocol activity.
Incorrect Answers:
A: A host-based IDS (HIDS) watches the audit trails and log fi les of a host system. It’s reliable for detecting
attacks directed against a host, whether they originate from an external source or are being perpetrated by a
user locally logged in to the host.
B: Firewalls provide protection by controlling traffic entering and leaving a network.
D: A spam filter is a software or hardware tool whose primary purpose is to identify and block/filter/remove
unwanted messages (that is, spam). Spam is most commonly associated with email, but spam also exists in
instant messaging (IM), short message service (SMS), Usenet, and web discussions/forums/comments/blogs.
References:
http://en.wikipedia.org/wiki/Intrusion_prevention_system
Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, pp. 42, 47
QUESTION 12
Which of the following should be deployed to prevent the transmission of malicious traffic between virtual
machines hosted on a singular physical device on a network?
A. HIPS on each virtual machine
B. NIPS on the network
C. NIDS on the network
D. HIDS on each virtual machine
Correct Answer: A
Section: Network Security
Explanation
Explanation/Reference:
Explanation:
Host-based intrusion prevention system (HIPS) is an installed software package which monitors a single host
for suspicious activity by analyzing events occurring within that host.
Incorrect Answers:
B: Network-based intrusion prevention system (NIPS) monitors the entire network for suspicious traffic by
analyzing protocol activity.
C: 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: A host-based IDS (HIDS) watches the audit trails and log files of a host system. It’s reliable for detecting
attacks directed against a host, whether they originate from an external source or are being perpetrated by a
user locally logged in to the host.
References:
http://en.wikipedia.org/wiki/Intrusion_prevention_system
Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, p. 21
QUESTION 13
Pete, a security administrator, has observed repeated attempts to break into the network. Which of the
following is designed to stop an intrusion on the network?
A. NIPS
B. HIDS
C. HIPS
D. NIDS
Correct Answer: A
Section: Network Security
Explanation
Explanation/Reference:
Explanation:
Network-based intrusion prevention system (NIPS) monitors the entire network for suspicious traffic by
analyzing protocol activity. The main functions of intrusion prevention systems are to identify malicious activity,
log information about this activity, attempt to block/stop it, and report it
Incorrect Answers:
B: A host-based IDS (HIDS) watches the audit trails and log files of a host system. It’s reliable for detecting
attacks directed against a host, whether they originate from an external source or are being perpetrated by a
user locally logged in to the host.
C: Host-based intrusion prevention system (HIPS) is an installed software package which monitors a single
host for suspicious activity by analyzing events occurring within that host.
D: 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.
References:
http://en.wikipedia.org/wiki/Intrusion_prevention_system
Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, p. 21
QUESTION 14
An administrator is looking to implement a security device which will be able to not only detect network
intrusions at the organization level, but help defend against them as well. Which of the following is being
described here?
A. NIDS
B. NIPS
C. HIPS
D. HIDS
Correct Answer: B
Section: Network Security
Explanation
Explanation/Reference:
Explanation:
Network-based intrusion prevention system (NIPS) monitors the entire network for suspicious traffic by
analyzing protocol activity. The main functions of intrusion prevention systems are to identify malicious activity,
log information about this activity, attempt to block/stop it, and report it
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.
C: Host-based intrusion prevention system (HIPS) is an installed software

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