Podcast
Questions and Answers
What is the purpose of a name server?
What is the purpose of a name server?
All domain names must have at least three name servers listed when registered.
All domain names must have at least three name servers listed when registered.
False
What are the commonly used names for the primary and backup name servers?
What are the commonly used names for the primary and backup name servers?
ns1servername.com and ns2servername.com
Each domain name consists of at least a __________ and a top-level domain.
Each domain name consists of at least a __________ and a top-level domain.
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Match the following domain categories with their descriptions:
Match the following domain categories with their descriptions:
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What must a domain name have when registered?
What must a domain name have when registered?
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A name server translates IP addresses into domain names.
A name server translates IP addresses into domain names.
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What is the purpose of having a domain name for a server?
What is the purpose of having a domain name for a server?
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Match the following terms with their definitions:
Match the following terms with their definitions:
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Study Notes
Email Fundamentals
- Email structure involves a mailbox name/username, organization name, and domain category (top-level domain)
- Internet's original purpose was US military research and development
- A set of domain categories was created to differentiate project groups
- Computers connected to the internet have unique IP addresses
- Many server owners also register domain names for their servers
- A domain name, like [email protected], comprises the mailbox name, organization name (ccilearning), and top-level domain (.com)
- Original top-level domains (TLDs) were inadequate as the internet became international, so two-letter country codes were introduced as TLDs
Domain Name Format
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Top-level domains (TLDs) are the last part of a domain name (e.g., .com, .org)
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TLDs are categorized into generic TLDs and country-specific TLDs
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Generic top-level domains (like .com, .org, .net) are often used by commercial companies, nonprofits, and network sites
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Countries use two-letter codes, e.g., .au (Australia), .ca (Canada) as TLDs
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New TLDs are being introduced, like .aero for air transport and .biz for businesses
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Domain names (like cornell.edu) are hierarchical
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.mil: for US military divisions, services, and agencies.
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.gov: for US government agencies.
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.com: for commercial companies, now widely used for various types of entities.
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.edu: for educational institutions
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.org: for organizations (used primarily by non-profit entities)
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.net: for network sites.
Domain Name Hierarchy
- A top-level domain (TLD) is the last part of a domain name, never used independently
- A second-level domain (SLD) combines with a TLD to form a full domain name (e.g. cornell in cornell.edu)
- Third-level domain names extend the hierarchy (e.g. arts.cornell.edu)
- Fourth-level and further levels are also possible, extending to four-part or more domains
DNS Servers
- Domain Name System (DNS) translates human-readable domain names (like namecheap.com) into IP addresses used by computers
- Organizations often have multiple servers
- Each domain name must have at least two name servers (e.g., ns1servername.com and ns2servername.com), with one acting as primary and the other for backups
- Name servers help users access websites by translating domain names into IP addresses
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Description
This quiz covers the essential elements of email structure and domain name formats, including mailbox names, organization names, and top-level domains (TLDs). Learn about the history of the internet and how domain categories are used to classify online entities. Delve into generic and country-specific TLDs that shape the web experience.
