SVAD 230 - Module 1

Topics for Week One

  • Cloud Networking
  • DNS
  • IPv4 and IPv6

Cloud Networking

Azure Virtual Networks

Assignment 1: Introduction to Azure Virtual Networks

Take a screen shot at the end to demonstrate you completed all the units, and submit it to Canvas.

Domain Naming Service (DNS)

What is DNS?

Read CloudFlare's What is DNS? How DNS Works article.

CloudFlare has several other articles on the various DNS record types (under the DNS Records menu). Read them to learn more about each one.

DNS Records

Read CloudFlare's What is a DNS record? article. Make sure you can explain A, CNAME, and TXT records and the time to live (TTL) attribute. MX, DKIM, SPF, and DMARC record types deal primarily with email servers and services. You can find another resource for DNS record types here. For example, to find all the public facing email servers for Microsoft:

 1dig microsoft.com mx
 2
 3; <<>> DiG 9.16.1-Ubuntu <<>> microsoft.com mx
 4;; global options: +cmd
 5;; Got answer:
 6;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 11159
 7;; flags: qr rd ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
 8;; WARNING: recursion requested but not available
 9
10;; QUESTION SECTION:
11;microsoft.com.                 IN      MX
12
13;; ANSWER SECTION:
14microsoft.com.          0       IN      MX      10 microsoft-com.mail.protection.outlook.com.
15
16;; Query time: 20 msec
17;; SERVER: x.x.x.x#53(x.x.x.x)
18;; WHEN: Thu Jun 15 21:54:57 EDT 2023
19;; MSG SIZE  rcvd: 101

1nslookup -type=mx microsoft.com
2Server: your-server-host-name
3Address: x.x.x.x
4
5Non-authoritative answer:
6microsoft.com   MX preference = 10, mail exchanger = microsoft-com.mail.protection.outlook.com

DNS Zones

Read CloudFlare's What is a DNS zone? article. Can you explain a DNS zone? Did you notice the link about reverse lookup zones? How do reverse lookup zones differ from primary (and other) zones? Read Microsoft's article on DNS zones. Make sure you understand the purpose for each zone type. Zone transfers allow another server to host a copy of the DNS zone you transferred. Zone delegation allows you to break up management of your zones into logical administrative units--ideally, it lessens the DNS admin burden on administrators.

IPv4 and IPv6

IPv4

Read Wikipedia's Internet Protocol version 4 article. Specifically, make sure you understand the "special-use addresses."

Question
No, we will not cover IP subnetting here. Feel free to research it on your own. (Or, check out the video below)

IPv6

Read Microsoft's Internet Protocol version 6 (IPv6) overview article. Make certain you understand these address types:

  • Unicast
  • link local
  • site local
  • multicast
  • anycast