What does the abbreviation ttl mean?

What does the abbreviation ttl mean?

• Transistor to Transistor Logic; DNS Resource Record Time To Live in seconds; MAX IP hops.
• The amount of a time a dns record can be cached before it should be looked up again.
• Low level hardware invented in the early 1960s, aka Transistor to Transistor Logic
• The number of hops an IP packet can take

EXPLANATION

TTL

Stands for "Time To Live." Pretty intense for a computer term, huh? It refers an aspect of the Internet Protocol. TTL is used when a "ping," or a request for a response, is sent to another computer, such as a server. The TTL represents the number of hops, or servers in different locations, the request can travel to before returning a failed attempt message.

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NAT stands for

NAT stands for

• Navigation Address Translation
• Network Address Translation.
• Network Area Transformation.
• Network Address Transformation 

EXPLANATION

Network Address Translation

Stands for "Network Address Translation." NAT translates the IP addresses of computers in a local network to a single IP address. This address is often used by the router that connects the computers to the Internet.

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In JavaScript, which of the following expressions evaluates to false?

In JavaScript, which of the following expressions evaluates to false?

• 0 == false
• "1" === 1
• 1 == true
• 1 === true 

EXPLANATION

Strict equality (===) means values which we are comparing must have the same type. This means "1" will not be equal to 1("1"===1 it will return false) Type converting equality (==) means automatically it will covert the variable to value irrespective of data type; either it is a string or a number.

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What is the subnet block size for the 192.168.10.0/27 network?

What is the subnet block size for the 192.168.10.0/27 network?

• 32
• 34
• 64
• 16 

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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What is an umbrella cell?

What is an umbrella cell?

• A cell infected by a virus developed by an international conglomeration.
• Coverage area of a transmitter in a television network
• Large mobile phone network covering smaller cells.
• A slang term used for a waterproof mobile phone with folding display. 

EXPLANATION

An umbrella cell covers several microcells. ... The power level inside an umbrella cell is increased comparing to power levels used in microcells that form the umbrella cell. When the speed ofthe mobile is too high, the mobile is handed off to the umbrella cell.

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