Networking Flashcard

Front

What is the primary purpose of a subnet mask?

Back

To identify the network and host portions of an IP address

Answer explanation

The primary purpose of a subnet mask is to identify the network and host portions of an IP address, allowing devices to determine which part of the address refers to the network and which part refers to the specific device.

Front

What is the function of NAT in networking?

Back

To translate private IP addresses to public IP addresses

Answer explanation

NAT (Network Address Translation) primarily functions to translate private IP addresses used within a local network to a public IP address for internet access, enabling multiple devices to share a single public IP.

Front

What is the main responsibility of the IETF?

Back

Setting technical standards for the Internet

Answer explanation

The IETF (Internet Engineering Task Force) is primarily responsible for setting technical standards for the Internet, ensuring interoperability and functionality across different systems and technologies.

Front

What does a MAC address consist of?

Back

Six hexadecimal numbers

Answer explanation

A MAC address consists of six hexadecimal numbers, typically represented as pairs separated by colons or hyphens. This format allows for a unique identifier for network interfaces on devices.

Front

Which Ethernet standard uses multi-mode optical fiber? Options: 1000Base-SX, 10Base-T, 100Base-TX, 1000Base-CX

Back

1000Base-SX

Answer explanation

1000Base-SX is the Ethernet standard that uses multi-mode optical fiber, allowing for high-speed data transmission over short distances. The other options, like 10Base-T and 100Base-TX, use copper cabling.

Front

What is the frequency of the 802.11n WiFi standard?

Back

2.4 and 5 GHz

Answer explanation

The 802.11n WiFi standard operates on both 2.4 GHz and 5 GHz frequency bands, allowing for greater flexibility and improved performance compared to earlier standards that were limited to just one of these frequencies.

Front

How many IPv4 addresses are available?

Back

Approximately 4.5 billion

Answer explanation

IPv4 addresses are 32-bit numbers, allowing for 2^32 total combinations, which equals approximately 4.3 billion. Thus, the closest answer is approximately 4.5 billion.

Front

What is the format of an IPv6 address? Options: Dotted decimal, Colon-separated hexadecimal, Slash-separated binary, Comma-separated octal

Back

Colon-separated hexadecimal

Answer explanation

An IPv6 address is represented in a colon-separated hexadecimal format, consisting of eight groups of four hexadecimal digits. This distinguishes it from other formats like dotted decimal or binary.

Front

What was the total number of IP addresses worldwide in 2021? Options: 1,541,605,760, 4,294,967,296, 330,321,408, 202,183,168

Back

4,294,967,296

Answer explanation

In 2021, the total number of IP addresses worldwide was 4,294,967,296, which corresponds to the maximum number of addresses available in IPv4, a widely used Internet Protocol.

Front

What is the ending IP address in the host network addresses range given in the example? Options: 172.16.0.0, 172.16.0.1, 172.16.31.254, 172.16.255.255

Back

172.16.31.254

Answer explanation

The ending IP address in the range for the 172.16.0.0/20 network is 172.16.31.254. This is calculated by taking the subnet mask of /20, which allows for 4096 addresses, with the last usable address being 172.16.31.254.