Chapter 5c

 Upon completion of this chapter, you should be able to:  Configure IP addresses  Identify & select valid IP addresses for networks  Configure a DHCP server  Configure a host to use DHCP for configuration  Troubleshoot & resolve IP addresses configuration and communication issues  Configure DNS addresses  Configure an IPv6 address

 1.3 Install and configure the following networking services/applications  DHCP  Static vs dynamic IP addressing  Reservations  Scopes  Leases  Options (DNS servers, suffixes)  IP helper/DHCP relay  DNS  DNS servers  DNS records (A, MX, AAAA, CNAME, PTR)  Dynamic DNS

5.3

 IP configuration used to be manual  Assign IP, SM, DG, DNS  DHCP takes care of that  At home, your router is a DHCP server  At work, you may have a dedicated DHCP server  Used for general purpose/PC devices  Static addressing for routers, switches, printers, Internet-accessible devices  DHCP addresses are leased for a time period

 Watch Professor Messer Video  DHCP Addressing Overview 5:15  TestOut Watch the video/script  TestOut Configure a DHCP Server Lab

 Dynamic Allocation  Sever has a pool of addresses  DHCP Servers use dynamic allocation  Keeps a list of what MAC addresses used each IP address  You’ll get the same IP address next time  Static Allocation  You configure an IP address for a specific device (printers, switches, router ports) via MAC DHCP Reservations 3:16

 The pool of addresses you tell it to give out  Along with the SM, DG, DNS server address, lease duration, etc. DHCP Scopes 2:10

 Allocated/assigned a lease time  If you reboot, it forgets & then requests an IP  Reallocation (remember DHCP server keeps list)  Lease starts over  Timers  T1 Checks in with DHCP server to renew lease (still in use) at 50% of lease time  T2 If DHCP server lost, it will check in at 7/8 time to hopefully update the time & renew DHCP Leases 4:09

 Stuff in addition to IP  SM, DG, DNS, lease time  Other options include VoIP settings  Such as the Call Server IP address for the phone DHCP Options 2:46

 TestOut Watch the video/script  TestOut Configure DHCP Options Lab

 TestOut Create DHCP Exclusions Lab  TestOut Create DHCP Client Reservations Lab  TestOut Watch the video/script  TestOut Configure a DHCP Client Lab  TestOut Practice Questions

5.4

 Your DHCP server may be on another subnet  Or a backup DHCP server is on another subnet  Broadcasts DO NOT pass routers  DHCP uses broadcasts ( )  DHCP relay  Configured on router to pass these broadcasts

 TestOut Watch the video/script  TestOut Configure a DHCP Relay Agent Lab  TestOut Add a DHCP Server on Another Subnet Lab  TestOut Practice Questions

5.5

 Each host is assigned a number (IP address)  It’s easier to remember names though  Originally, each device had a simple text hosts file that mapped names to numbers  It had to be on each device  List got to big  Hard to update

 Servers that translates names to IP addresses  DNS servers know some, forward rest to higher authority DNS servers  The main DNS servers are called Root Servers  Other companies & ISPs have their own DNS servers that connect to the Root Servers  Your PC connects to a DNS server (usually your ISPs) Root Servers

 Go to a website  Checks DNS cache 1 st  Not there? Go to your DNS server  Not there? It queries the next higher DNS server

 Nslookup  Get in the mode and then enter domain  Ipconfig /displaydns  Displays cached DNS  Ipconfig /flushdns  Removes all cached DNS entries

 Use nslookup, displaydns, flushdns DNS Overview 6:28

 Root domain  Top-level domain (TLD)  Fully qualified domain name (FQDN)  Records  Authoritative server

 DNS server has many records to resolve names  Records include name field (domain name), address, type field (type of resource, usually Internet)  Common types of DNS records: TypeDescription AA host’s IPv4 address AAAAA host’s IPv6 address MXMail Server NSAuthoritative Name Server CNAMEAnother name for a host/ Alias DNS Records 5:53

.edu,.org, and.gov are all what kind of domains?  Top-level domains  What kind of server is being used if you have to add an MX record to the DNS settings?  Mail server  A host has been assigned an IP address of What kind of address is this?  APIPA

 Unit 5c DHCP/DNS Packet Tracer Lab

 Lab  Configure static & dynamic DHCP  Configure a DNS Server

 TestOut Watch the video/script  TestOut Watch the video/script  TestOut Configure DNS Addresses Lab  TestOut Create Standard DNS Zones Lab  TestOut Create Reverse DNS Zones Lab  TestOut Create Host Records Lab  TestOut Create CNAME Records Lab  TestOut Troubleshoot DNS Records Lab  TestOut Practice Questions

Chapter 5c