When it comes to hardware, what does CMOS stand for?

When it comes to hardware, what does CMOS stand for?

• Complementary Metal Oxide Semiconductor
• Carbon Magnesium Oxide Silicon
• Complete Memory Onboard System
• Computer Memory On Semiconductor 

EXPLANATION

CMOS. Stands for "Complementary Metal Oxide Semiconductor." It is a technology used to produce integrated circuits. CMOS circuits are found in several types of electronic components, including microprocessors, batteries, and digital camera image sensors

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Linux is named after:

Linux is named after:

• Linus Pauling
• Linus van Pelt
• Linus Sebastian
• Linus Torvalds 

EXPLANATION

Torvalds was named after Linus Pauling, the Nobel Prize-winning American chemist, although in the book Rebel Code: Linux and the Open Source Revolution, Torvalds is quoted as saying, "I think I was named equally for Linus the Peanuts cartoon character", noting that this makes him half "Nobel Prize-winning chemist" and half "blanket-carrying cartoon character.

Linus Torvalds had wanted to call his invention Freax, a portmanteau of "free", "freak", and "x" (as an allusion to Unix). During the start of his work on the system, he stored the files under the name "Freax" for about half of a year. ... So, he named the project "Linux" on the server without consulting Torvalds

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When it comes to security, what does IDS stand for?

When it comes to security, what does IDS stand for?

• Intrusion Defense System
• Integrated Delivery System
• Integrated Deterrence System
• Intrusion Detection System 

EXPLANATION

Intrusion Detection System (IDS)

An Intrusion Detection System (IDS) is a system that monitors network traffic for suspicious activity and issues alerts when such activity is discovered. It is a software application that scans a network or a system for harmful activity or policy breaching. Any malicious venture or violation is normally reported either to an administrator or collected centrally using a security information and event management (SIEM) system. A SIEM system integrates outputs from multiple sources and uses alarm filtering techniques to differentiate malicious activity from false alarms.
Although intrusion detection systems monitor networks for potentially malicious activity, they are also disposed to false alarms. Hence, organizations need to fine-tune their IDS products when they first install them. It means properly setting up the intrusion detection systems to recognize what normal traffic on the network looks like as compared to malicious activity.
Intrusion prevention systems also monitor network packets inbound the system to check the malicious activities involved in it and at once sends the warning notifications.
Classification of Intrusion Detection System:
IDS is basically classified into 2 types:

1. Network Intrusion Detection System (NIDS):
   Network intrusion detection systems (NIDS) are set up at a planned point within the network to examine traffic from all devices on the network. It performs an observation of passing traffic on the entire subnet and matches the traffic that is passed on the subnetts to the collection of known attacks. Once an attack is identified or abnormal behavior is observed, the alert can be sent to the administrator. An example of an NIDS is installing it on the subnet where firewalls are located in order to see if someone is trying crack the firewall.


2. Host Intrusion Detection System (HIDS):
   Host intrusion detection systems (HIDS) run on independent hosts or devices on the network. A HIDS monitors the incoming and outgoing packets from the device only and will alert the administrator if suspicious or malicious activity is detected. It takes a snapshot of existing system files and compares it with the previous snapshot. If the analytical system files were edited or deleted, an alert is sent to the administrator to investigate. Anexample of HIDS usage can be seen on mission critical machines, which are not expected to change their layout.

Detection Method of IDS:

1. Signature-based Method:
   Signature-based IDS detects the attacks on the basis of the specific patterns such as number of bytes or number of 1’s or number of 0’s in the network traffic. It also detects on the basis of the already known malicious instruction sequence that is used by the malware. The detected patterns in the IDS are known as signatures. Signature-based IDS can easily detect the attacks whose pattern (signature) already exists in system but it is quite difficult to detect the new malware attacks as their pattern (signature) is not known.
   
2. Anomaly-based Method:
   Anomaly-based IDS was introduced to detect the unknown malware attacks as new malware are developed rapidly. In anomaly-based IDS there is use of machine learning to create a trustful activity model and anything coming is compared with that model and it is declared suspicious if it is not found in model. Machine learning based method has a better generalized property in comparison to signature-based IDS as these models can be trained according to the applications and hardware configurations.

Comparison of IDS with Firewalls:
IDS and firewall both are related to the network security but an IDS differs from a firewall as a firewall looks outwardly for intrusions in order to stop them from happening. Firewalls restrict access between networks to prevent intrusion and if an attack is from inside the network it don’t signal. An IDS describes a suspected intrusion once it has happened and then signals an alarm.

 

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What is the CIDR notation for subnet mask 255.255.255.240 (IPv4)?

What is the CIDR notation for subnet mask 255.255.255.240 (IPv4)?

• 28
• 31
• 34
• 25 

EXPLANATION

---

	Addresses	Hosts	Netmask	Amount of a Class C
/30	4	2	255.255.255.252	1/64
/29	8	6	255.255.255.248	1/32
/28	16	14	255.255.255.240	1/16
/27	32	30	255.255.255.224	1/8
/26	64	62	255.255.255.192	1/4
/25	128	126	255.255.255.128	1/2
/24	256	254	255.255.255.0	1
/23	512	510	255.255.254.0	2
/22	1024	1022	255.255.252.0	4
/21	2048	2046	255.255.248.0	8
/20	4096	4094	255.255.240.0	16
/19	8192	8190	255.255.224.0	32
/18	16384	16382	255.255.192.0	64
/17	32768	32766	255.255.128.0	128
/16	65536	65534	255.255.0.0	256

 

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Which of these is NOT a core function of a mobile device management product?

Which of these is NOT a core function of a mobile device management product?

• Remote wipe of device
• Application Management
• Authentication
• Allow the company to use the same Apple ID on more than ten devices 

EXPLANATION

Following are the core functions of current day’s EMM suite

• Application Inventory
• Hardware Inventory
• Mobile Application Deployment
• Mobile app configuration
• Policy Management
• Mobile application updating and removal
• Executes Remote Actions
• Mobile Content Management

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