CCNA 4 is the last in the four courses leading to accreditation as a Cisco Certified Network Associate. It has the following subjects or topics: Advanced IP addressing techniques; Network Address Translation (NAT); Port Address Translation (PAT); Dynamic Host Configuration Protocol (DHCP); WAN technology terminology; PPP; ISDN; DDR; Frame Relay; and Network Management.
 
Adtran is rated as one of the most successful types of network access and communications equipment today, with 1,400 solutions for telecommunications networks presently in use. Cisco makes use of the Adtran terminal adapter and every student is expected to be familiar with it. In CCNA 4, students will get to know more about Adtran. To make a successful connection to an ISDN switch, it is necessary to configure an ISDN router. An Adtran Atlas 550 ISDN emulator is used to simulate the ISDN switch and cloud. Adtran products have been an inevitable part of past lab practice sessions in CCNA 4 because Adtran equipment are used in Cisco technology. The Adtran Atlas 550 Base Unit which Cisco uses includes: Chassis; power supply and system controller; integral 10/100 Ethernet for direct LAN connection; 2 slots for Network Interfaces (1 T1/PRI or E1/PRA included); 4 option module slots; frame relay software (included with base unit); and the SNMP, Telnet, and VT100 management support.. 
 
Upon completion of CCNA 4, the student is expected to have knowledge of networking for the small office, and home office market (so one can work in small businesses and organizations that have fewer than 100 nodes.)

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