Computer Science - Networking - Discussion

Very informative, Thanks, everyone.

The DNIC has three digits to identify the country (one to identify a zone and two to identify the country within the zone) and one to identify the PDN (allowing only ten in each country).

For suppose.

The DNIC no of the country Germany: 262 2 (packet switched data service).

Here 262 represents data country code & last single digit "2"represents the netwrok digit (packet switched data service) -name of the n/w to which DNIC is located.

In computer networking, DNIC typically stands for: Data Network Identification Code.

Key Facts:

* A DNIC is a 4-digit code used to identify a public data network in X.25 packet-switched networks.
* It’s defined by the ITU-T standard X.121 , which is the addressing scheme used in X.25 networks.
* The DNIC helps in routing packets by identifying the country and the network provider.

Structure:

* The first 3 digits usually identify the country.
* The 4th digit identifies the specific network within that country.

Example:

* DNIC 3106 could refer to a specific public data network in the United States.

Usage Context:

* Mostly historical or used in legacy systems, since X.25 has largely been replaced by modern protocols like TCP/IP.
* Still relevant in certain telecom, banking, or industrial control systems where X.25 remains in use.

Agree @Karthika.

The NTN identifies the exact network device (DTE, data terminal equipment) in the packet-switched network (PSN) and is often provided as an NUA. There are no rules to the structure of the NTN.

Please explain it with the example.

The address is made up of the international data number (IDN), which consists of two fields: the 4 digit data network identification code (DNIC) and the (up to) 10 digit national terminal number (NTN). SO, the right answer is 4 digits (option B).

The first four digits of the international data number, the three digits that may represent the data country code, and the 1-digit network code, 1, the network digit.

In the DNIC, the first four digits of the international data number, the three digits that may represent the data country code, and the 1-digit network code, i.e, the network digit.

Please explain whether the answer is 3 or 4?