Network+ Code Input

nslookup

queries DNS for host addresses, IP address, mail exchanges, nameservers, etc (anything in DNS records)

ping

verifies connectivity to the server

route print

shows the local routing table

ARP

lists MAC to IP address table

telnet

open a command-line interface on a remote computer or server (not secure) (text based)

Nmap

it is a network scanner that helps discover hosts and services

tracert

(Windows) - tracks the pathway taken by a packet on an IP network from source to destination. Reporting the IP addresses of all the routers it pinged in between

traceroute

(Linux based) - same as tracert, but for non windows machines (tracks the pathway taken by a packet on an IP network from source to destination. Reporting the IP addresses of all the routers it pinged in between)

netstat

displays network connections for: TCP (incoming and outgoing), routing tables, and several network interface and network protocol statistics

show mac-address-table

displays the MAC addresses learned by the switch and the corresponding switch ports

dig

queries DNS to obtain info about host addresses, mail exchanges, nameservers, and related information

dig -t any example.com

retrieves all available DNS records for the specified domain

dig -t soa example.com

retrieves the start of authority (SOA) records

dig -t ns example.com

retrieves name server (NS) records

dig -t mx example.com

retrieves mail exchange (MX) records

show vlan brief

lists all VLANs on the switch along with their assigned ports. a quick overview necessary for reconfiguration tasks

show vlan

details about the VLANs configured on the switch, including VLAN IDs, names, and associated interfaces

show running-config

includes VLAN configurations but is too extensive for a quick VLAN review

show ip interface brief

summary of interface statuses and IP configurations

show interfaces trunk

shows trunk ports and their allowed VLANs, not the comprehensive VLAN setup