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CCNA 4 v3.0 Module 1 Scaling IP Addresses. Exams if applicable Voucher Information Chapter 1 Lecture – IP/DHCP Marks for Unit 3 Issue of Group Assignment. Session 2. Note University Network Information Return Sem3 assignments Note Schedule Change Sem 4 Assignment ‘Schools’
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Exams if applicable • Voucher Information • Chapter 1 Lecture – IP/DHCP • Marks for Unit 3 • Issue of Group Assignment
Session 2 • Note University Network Information • Return Sem3 assignments • Note Schedule Change • Sem 4 Assignment ‘Schools’ • Chapter 1 Recap • Chapter 1 Labs
Voucher Information • A score of "voucher eligible" on the CCNA 4 Version 3.0 or 3.1 voucher exam enables a user who did NOT earn an INTRO voucher in CCNA 2 to either choose vouchers for both the INTRO and the ICND exams or to choose a voucher for the CCNA exam. Students have three attempts on the CCNA 4 voucher exam.
Objectives • Scaling networks with Network Address Translation and Port Address Translation • Dynamic Host Configuration Protocol
NAT • A NAT-enabled device typically operates at the border of a stub network.
NAT Terms • Inside Local Addresses – An IP address assigned to a host inside a network. This address is likely to be a RFC 1918 private address. • Inside Global Address – A legitimate IP address assigned by the NIC or service provider that represents one or more inside local IP address to the outside world. • Outside Local Address - The IP address of an outside host as it known to the hosts in the inside network. • Outside Global Address - The IP address assigned to a host on the outside network. The owner of the host assigns this address.
NAT Features • Static NAT is designed to allow one-to-one mapping of local and global addresses. • Dynamic NAT is designed to map a private IP address to a public address.
PAT Features • PAT uses unique source port numbers on the inside global IP address to distinguish between translations.
NAT Benefits • Eliminates re-assigning each host a new IP address when changing to a new ISP • Eliminates the need to re-address all hosts that require external access, saving time and money • Conserves addresses through application port-level multiplexing • Protects network security
DHCP • DHCP works by providing a process for a server to allocate the IP information to clients. Clients lease the information from the server for an administratively defined period.
BOOTP and DHCP Differences • DHCP defines mechanisms through which clients can be assigned an IP address for a finite lease period. This lease period allows for re-assignment of the IP address to another client later, or for the client to get another assignment, if the client moves to another subnet. Clients may also renew leases and keep the same IP address. • DHCP provides the mechanism for a client to gather other IP configuration parameters, such as WINS and domain name.
Major DHCP Features • Automatic Allocation • Manual Allocation • Dynamic Allocation
