As a network designer, you will want to allocate IPv4 address space to allow for route summarization. Large networks can grow quickly from 500 routes …
Performing Route Summarization – Internet Protocol Version 4 (IPv4) Design
Private and Public IP Address and NAT Guidelines – Internet Protocol Version 4 (IPv4) Design
Use public IPv4 addresses on external-facing devices that require connectivity to the Internet and external organizations. Examples include the following: The following are some public/private …
Case Study: IP Address Subnet Allocation – Internet Protocol Version 4 (IPv4) Design
Consider a company that has users in several buildings in a campus network. Building A has four floors, and building B has two floors, with …
Address Assignment and Name Resolution – Internet Protocol Version 4 (IPv4) Design
Device network configuration parameters such as IP addresses, subnet masks, default gateways, and DNS server IP addresses can be assigned statically by an administrator or …
DHCP – Internet Protocol Version 4 (IPv4) Design
Dynamic Host Configuration Protocol (DHCP) provides a way to dynamically configure hosts on a network. Based on BOOTP, it is defined in RFC 2131 and …
DNS – Internet Protocol Version 4 (IPv4) Design
Domain Name System (DNS) is an Internet-based directory system that returns a destination IP address, given a domain name (such as www.cisco.com). DNS is a …
ARP – Internet Protocol Version 4 (IPv4) Design
When an IP host needs to send an IP packet over an Ethernet network, it needs to find out what 48-bit MAC physical address to …
Introduction to IPv6 – Internet Protocol Version 6 (IPv6) Design
To prepare for the ENSLD 300-420 exam, you should become very familiar with IPv6 specifications, addressing, and design. The driving motivation for the adoption of …
IPv6 Header – Internet Protocol Version 6 (IPv6) Design
This section covers the field of the IPv6 header. The IPv6 header is simpler than the IPv4 header. Some IPv4 fields have been eliminated or …
IPv6 Address Representation – Internet Protocol Version 6 (IPv6) Design
RFC 4291 (which obsoletes RFC 3513 and RFC 2373) specifies the IPv6 addressing architecture. IPv6 addresses are 128 bits in length. For display, the IPv6 …