Installing and Troubleshooting Networks Chapter Eighteen Installing and Troubleshooting Networks

3.0 Objectives Covered 3.1 Troubleshoot client-side connectivity issues using appropriate tools TCP/IP settings Gateway Subnet mask DNS DHCP (dynamic vs. static) NAT (private and public) Characteristics of TCP/IP Loopback addresses Automatic IP addressing Mail protocol settings SMTP IMAP POP FTP settings Ports IP addresses Exceptions Programs Proxy settings Ports IP addresses Exceptions Programs Tools (use and interpret results) Ping Tracert Nslookup Netstat Net use Net /? Ipconfig Telnet SSH Secure connection protocols HTTPS Firewall settings Open and closed ports Program filters 2

3.0 Objectives Covered 3.2 Install and configure a small office home office (SOHO) network Connection types Dial-up Broadband DSL Cable Satellite ISDN Wireless All 802.11 WEP WPA SSID MAC filtering DHCP settings Routers/Access points Disable DHCP Use static IP Change SSID from default Disable SSID broadcast Change default username and password Update firmware Firewall LAN (10/100/1000BaseT, Speeds) Bluetooth (1.0 vs. 2.0) Cellular Basic VoIP (consumer applications) Basics of hardware and software firewall configuration Port assignment/setting up rules (exceptions) Port forwarding/port triggering Physical installation Wireless router placement Cable length 3 © Wiley Inc. 2009. All Rights Reserved.

Choosing an Internet Connection Dial-up/POTS DSL Cable ISDN Satellite

Internet Connection Summary Designation Download Speed Range Description POTS 2400bps to 56Kbps Plain old telephone service. A regular analog phone line. DSL 256Kbps to 12Mbps Digital subscriber line. Shares existing phone wires with voice service. Cable 128Kbps to 50Mbps Inexpensive broadband Internet access method with wide availability. ISDN 64Kbps to 1.5Mbps Integrated Services Digital Network. Once popular for home office Internet connections. Satellite 128Kbps to 1.5Mbps Great for rural areas without cabled broadband methods.

Choosing Internal Network Connections Wired connections Twisted pair Fiber optic Wireless connections 802.11 Bluetooth Cellular

802.11x and Cellular Standards Type Frequency Maximum Data Rate Indoor Range Outdoor 802.11a 5GHz 54Mbps 35m 120m 802.11b 2.4GHz 11Mbps 40m 140m 802.11g 802.11n 2.4/5GHz 300Mbps 70m 250m Cellular Standard Maximum Data Rate Range Availability GSM 171Kbps 35 kilometers (22 miles) Worldwide CDMA 3Mbps 100 kilometers (62 miles) United States

Installing a Network Planning Physical installation Network cards Configuration Wireless network cards Network cables Wireless access points and routers

Types of Firewalls Network-based Host-based

Firewall Concepts Default deny or default allow Access Control List (ACL) Port forwarding Port triggering

Troubleshooting TCP/IP Basic settings IP address Subnet mask Default gateway DNS DHCP APIPA NAT Loopback address 127.0.0.1

TCP/IP Protocols SMTP POP IMAP FTP SSH HTTPS

Client Side Tools ping tracert nslookup netstat net use net /? ipconfig telnet ssh