SY0-401 Exam
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2021 Mar SY0-401 exams
Q371. Which of the following solutions provides the most flexibility when testing new security controls prior to implementation?
A. Trusted OS
B. Host software baselining
C. OS hardening
D. Virtualization
Answer: D
Explanation:
Virtualization is used to host one or more operating systems in the memory of a single host computer and allows multiple operating systems to run simultaneously on the same hardware. Virtualization offers the flexibility of quickly and easily making backups of entire virtual systems, and quickly recovering the virtual system when errors occur. Furthermore, malicious code compromises of virtual systems rarely affect the host system, which allows for safer testing and experimentation.
Q372. Which of the following wireless security measures can an attacker defeat by spoofing certain properties of their network interface card?
A. WEP
B. MAC filtering
C. Disabled SSID broadcast
D. TKIP
Answer: B
Explanation:
MAC filtering is typically used in wireless networks. In computer networking, MAC Filtering (or GUI filtering, or layer 2 address filtering) refers to a security access control method whereby the 48-bit address assigned to each network card is used to determine access to the network. MAC addresses are uniquely assigned to each card, so using MAC filtering on a network permits and denies network access to specific devices through the use of blacklists and whitelists. While the restriction of network access through the use of lists is straightforward, an individual person is not identified by a MAC address, rather a device only, so an authorized person will need to have a whitelist entry for each device that he or she would use to access the network. While giving a wireless network some additional protection, MAC filtering can be circumvented by scanning a valid MAC (via airodumping) and then spoofing one's own MAC into a validated one.
Q373. A network technician is on the phone with the system administration team. Power to the server room was lost and servers need to be restarted. The DNS services must be the first to be restarted. Several machines are powered off. Assuming each server only provides one service, which of the following should be powered on FIRST to establish DNS services?
A. Bind server
B. Apache server
C. Exchange server
D. RADIUS server
Answer: A
Explanation:
BIND (Berkeley Internet Name Domain) is the most widely used Domain Name System (DNS) software on the Internet. It includes the DNS server component contracted for name daemon. This is the only option that directly involves DNS.
Q374. A company has implemented PPTP as a VPN solution. Which of the following ports would need to be opened on the firewall in order for this VPN to function properly? (Select TWO).
A. UDP 1723
B. TCP 500
C. TCP 1723
D. UDP 47
E. TCP 47
Answer: C,D
Explanation:
A PPTP tunnel is instantiated by communication to the peer on TCP port 1723. This TCP connection is then used to initiate and manage a second GRE tunnel to the same peer. The PPTP GRE packet format is non-standard, including an additional acknowledgement field replacing the typical routing field in the GRE header. However, as in a normal GRE connection, those modified GRE packets are directly encapsulated into IP packets, and seen as IP protocol number 47.
Q375. A security manager must remain aware of the security posture of each system. Which of the following supports this requirement?
A. Training staff on security policies
B. Establishing baseline reporting
C. Installing anti-malware software
D. Disabling unnecessary accounts/services
Answer: B
Explanation:
The IT baseline protection approach is a methodology to identify and implement computer security
measures in an organization. The aim is the achievement of an adequate and appropriate level of
security for IT systems. This is known as a baseline.
A baseline report compares the current status of network systems in terms of security updates,
performance or other metrics to a predefined set of standards (the baseline).
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Q376. A bank has a fleet of aging payment terminals used by merchants for transactional processing. The terminals currently support single DES but require an upgrade in order to be compliant with security standards. Which of the following is likely to be the simplest upgrade to the aging terminals which will improve in-transit protection of transactional data?
A. AES
B. 3DES
C. RC4
D. WPA2
Answer: B
Explanation:
3DES (Triple DES) is based on DES.
In cryptography, Triple DES (3DES) is the common name for the Triple Data Encryption Algorithm symmetric-key block cipher, which applies the Data Encryption Standard (DES) cipher algorithm three times to each data block. The electronic payment industry uses Triple DES and continues to develop and promulgate standards based upon it (e.g. EMV). Microsoft OneNote, Microsoft Outlook 2007, and Microsoft System Center Configuration Manager 2012, use Triple DES to password protect user content and system data.
Q377. A company is trying to implement physical deterrent controls to improve the overall security posture of their data center. Which of the following BEST meets their goal?
A. Visitor logs
B. Firewall
C. Hardware locks
D. Environmental monitoring
Answer: C
Explanation:
Hardware security involves applying physical security modifications to secure the system(s) and preventing them from leaving the facility. Don’t spend all of your time worrying about intruders coming through the network wire while overlooking the obvious need for physical security. Hardware security involves the use of locks to prevent someone from picking up and carrying out your equipment.
Q378. Which of the following authentication services uses a ticket granting system to provide access?
A. RADIUS
B. LDAP
C. TACACS+
D. Kerberos
Answer: D
Explanation:
The basic process of Kerberos authentication is as follows:
The subject provides logon credentials.
The Kerberos client system encrypts the password and transmits the protected credentials to the
KDC.
The KDC verifies the credentials and then creates a ticket-granting ticket (TGT—a hashed form of
the subject’s password with the addition of a time stamp that indicates a valid lifetime). The TGT is
encrypted and sent to the client.
The client receives the TGT. At this point, the subject is an authenticated principle in the Kerberos
realm.
The subject requests access to resources on a network server. This causes the client to request a
service ticket (ST) from the KDC.
The KDC verifies that the client has a valid TGT and then issues an ST to the client. The ST
includes a time stamp that indicates its valid lifetime.
The client receives the ST.
The client sends the ST to the network server that hosts the desired resource.
The network server verifies the ST. If it’s verified, it initiates a communication session with the
client. From this point forward, Kerberos is no longer involved.
Q379. An organization must implement controls to protect the confidentiality of its most sensitive data. The company is currently using a central storage system and group based access control for its sensitive information. Which of the following controls can further secure the data in the central storage system?
A. Data encryption
B. Patching the system
C. Digital signatures
D. File hashing
Answer: A
Explanation:
Q380. Jane, an IT security technician, needs to create a way to secure company mobile devices. Which of the following BEST meets this need?
A. Implement voice encryption, pop-up blockers, and host-based firewalls.
B. Implement firewalls, network access control, and strong passwords.
C. Implement screen locks, device encryption, and remote wipe capabilities.
D. Implement application patch management, antivirus, and locking cabinets.
Answer: C
Explanation: Screen-lock is a security feature that requires the user to enter a password after a short period of inactivity before they can access the system again. This feature ensures that if your device is left unattended or is lost or stolen, it will be difficult for anyone else to access your data or applications. Device encryption encrypts the data on the device. This feature ensures that the data on the device cannot be accessed in a useable form should the device be stolen. Remote wipe is the process of deleting data on a device in the event that the device is stolen. This is performed over remote connections such as the mobile phone service or the internet connection and helps ensure that sensitive data is not accessed by unauthorized people.