Questions and Answers
What transport layer protocol does DNS normally use?
UDP
A DNS TTL determines what?
How long a DNS entry is allowed to be cached
How many root servers are there?
13
An A Record contains what?
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Select all that are true regarding domain names and IP addresses. (Select all that apply)
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MX stands for ________.
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A fully qualified domain name can contain how many characters?
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What are the four things that all computers need configured in order to operate on a modern network? (Select all that apply)
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When using Fixed Allocation DHCP, what's used to determine a computer's IP?
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The process by which a client configured to use DHCP attempts to get network configuration information is known as _________________.
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NAT addresses concerns over the dwindling IPv4 address space by ___________________.
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What technique allows for inbound traffic through a NAT?
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The total number of IPv4 addresses is approximately:
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Two-factor authentication is_________________________.
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VPNs are known as a _____ protocol.
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A proxy is something that _______________________.
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A technique that's used to route traffic to different destinations, depending on factors like location, congestion, or link health, is known as _____.
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A concept that involves iterating over a list of items one by one in an orderly fashion is known as _______.
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Administration and definition of TLDs are handled by a non-profit organization known as _______.
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When a range of IP addresses is set aside for client devices, and one of these IPs is issued to these devices when they request one, this is known as _______ allocation.
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VPN stands for _______
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A company moves a popular website to a new web host. Which of the following will change as a result?
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Study Notes
DNS Protocols and Records
- DNS primarily uses UDP for transport, with TCP as an alternative.
- DNS TTL (Time to Live) specifies how long a DNS entry can be cached, influencing DNS lookup efficiency.
- There are 13 root DNS servers globally, establishing the foundation for the DNS hierarchy.
- An A Record is used to map a domain name to an IPv4 address, facilitating web traffic routing.
- Domain name configurations can vary: a single domain can point to one or multiple IPs, and multiple domains can link to a single IP.
Email and Domain Naming
- MX (Mail Exchange) records direct email traffic by linking domain names to mail server IPs.
- A fully qualified domain name (FQDN) has a maximum length limit of 255 characters.
Network Configuration Essentials
- Essential configurations for a computer on a modern network include an IP address, name server, subnet mask, and default gateway.
- DHCP (Dynamic Host Configuration Protocol) Discovery is the process by which a client retrieves network configuration.
IP Address Management
- Fixed Allocation DHCP assigns a specific IP address to a device based on its MAC address.
- NAT (Network Address Translation) mitigates IPv4 address shortages by enabling non-routable addresses to access the internet.
- Port forwarding allows external inbound traffic through NAT-configured routers.
IPv4 Facts and Security Measures
- Approximately 4.2 billion unique IPv4 addresses exist.
- Two-factor authentication enhances security by requiring additional credentials beyond a username and password.
Networking Protocols and Techniques
- VPNs (Virtual Private Networks) serve as tunneling protocols, creating encrypted connections.
- Proxies act on behalf of other entities to handle communication requests.
- Anycast routing directs traffic based on multiple factors like location or network congestion.
- Round robin is an equitable distribution technique, allocating requests among a pool of resources.
Domain Administration
- ICANN (Internet Corporation for Assigned Names and Numbers) oversees the administration of top-level domains (TLDs), maintaining the domain name system.
- Dynamic Allocation in DHCP produces flexible IP address assignment, where devices receive addresses from a pre-defined pool.
Transitioning Web Hosts
- When a company relocates a website to a different host, the associated Internet Protocol address will change, although the domain name remains the same due to DNS.
Studying That Suits You
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Description
Test your knowledge on network services in computer networking with this flashcard quiz for Week 4. Topics include DNS protocols, TTL, and root servers. Perfect for reinforcing your understanding of key concepts in networking.
