CCNA Explorer 3 Basic Switch Concepts and Configuration

CSMA/CD on a multi-access half-Dublex network

1. Carrier Sense 2. Collision Detection 3. Jam Signal 4. Random Backoff

Difference between Unicast, Multicast and Broadcast

IEEE 802.3 Ethernet frame

Mac address format

Duplex settings

MAC table population step 1

MAC table population step 2

MAC table population step 3

MAC table population step 4

Collision Domain

Network Latency

Broadcast Domain

Collision Domain

Removing Server Bottlenecks

Switch Packet Forwarding Methods

Store-and-Forward - Gemmer pakken og tjekker for crc fejl Cut-Through Switching - Switcher pakken når den har læst destinationen Fast-forward - Switcher pakken med det samme den har læst destinationen Fragment-free - Læser de første 64 byte og sender videre.

Symmetric vs. Asymmetric Switching

L2 and L3 Switching

L3 Switch and Router comparison

Navigating Command-Line Interfaces Modes EXEC modes Navigation configuration modes Context Sensitive Help Console Error Messages Command history buffer Configure the Command History Buffer Switch Boot Sequence Rollover cable Hyperterminal Watch boot sequence Configure IP connectivity Step 1 Configure IP connectivity Step 2 Verify IP Connectivity Configuring Duplex and Speed Configure web interface show mac address-table Create static MAC entry: mac-address-table static <MAC address> vlan {1-4096, ALL} interface interface-id Show Commands Show Commands Backup configuration Restore configuration Backup to TFTP server Erase nvram: Filsystem prefixer Configure console access Configure VTY access EXEC mode password Configure encypted passwords Password recovery Banner login Banner motd Telnet & SSH Transport input telnet Transport input SSH Hvad med aaa new-model & username cisco password cisco Common Security Attacks MAC Address Flooding MAC flooding attack step 1 MAC flooding attack step 2 MAC flooding attack step 3 MAC flooding attack step 4 MAC flooding attack step 5 SDM Templates DHCP Spoofing DHCP Spoofing CDP Attack Telnet Attack Security Tools Switchport Security Switchport Security configuration Verify port security Secure Unused Ports Security Violation Modes Protect: When the number of secure MAC addresses reaches the limit allowed on the port, packets with unknown source addresses are dropped. Restrict: When the number of secure MAC addresses reaches the limit allowed on the port, packets with unknown source addresses are dropped. A SNMP trap is sent, a syslog message is logged, and the violation counter increments. Shutdown(Default): In this mode, a port security violation causes the interface to immediately become error-disabled and turns off the port LED. It also sends an SNMP trap, logs a syslog message. References