Podcast
Questions and Answers
Which command can you use to determine whether your computer can still contact the Windows NT server named FileSrv2?
Which command can you use to determine whether your computer can still contact the Windows NT server named FileSrv2?
ping
Which command can you use to check the connection when your TCP/IP connection suddenly stops working?
Which command can you use to check the connection when your TCP/IP connection suddenly stops working?
netstat
Which command can you use to check the connection when a computer cannot contact a server by its NetBIOS name?
Which command can you use to check the connection when a computer cannot contact a server by its NetBIOS name?
nbtstat
Which command displays network activity statistics for TCP, UDP, and IP?
Which command displays network activity statistics for TCP, UDP, and IP?
Which utility are you most likely to use to view the default gateway information for a Windows Server 2003 system?
Which utility are you most likely to use to view the default gateway information for a Windows Server 2003 system?
Which utility would you use to track the route a packet takes as it crosses the network?
Which utility would you use to track the route a packet takes as it crosses the network?
Which TCP/IP utility gives you output showing the interface and physical address?
Which TCP/IP utility gives you output showing the interface and physical address?
Which TCP/IP utility provides the cached NetBIOS name-to-IP address mappings?
Which TCP/IP utility provides the cached NetBIOS name-to-IP address mappings?
Which TCP/IP utility shows the routing table?
Which TCP/IP utility shows the routing table?
Which TCP/IP utility allows you to test connectivity by sending packets?
Which TCP/IP utility allows you to test connectivity by sending packets?
Which TCP/IP utility provides a list of all active connections?
Which TCP/IP utility provides a list of all active connections?
Which TCP/IP utility displays the ARP cache?
Which TCP/IP utility displays the ARP cache?
Which TCP/IP utility displays the current IP configuration?
Which TCP/IP utility displays the current IP configuration?
What command can you use to see active connections and their states?
What command can you use to see active connections and their states?
Which tool would you use to view the MAC addresses associated with recently contacted IP addresses?
Which tool would you use to view the MAC addresses associated with recently contacted IP addresses?
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Study Notes
Networking Commands Overview
- Ping: Tests connectivity to a specified server or IP address; useful for checking if a network device is reachable.
- Netstat: Displays active network connections, statistics, and information about protocols such as TCP, UDP, and IP.
- Nbtstat: Primarily used for checking connections to NetBIOS names and viewing NetBIOS name cache.
- Ipconfig: Command to view and configure network interface settings, including the default gateway on Windows systems.
- Traceroute: Tracks the path packets take from one device to another over a network; useful for diagnosing connectivity issues.
- Arp: Displays and modifies the Address Resolution Protocol (ARP) cache, which maps IP addresses to physical MAC addresses.
Connection Troubleshooting
- Utilize ping when a workstation cannot contact a server to check for basic connectivity issues.
- Use netstat to examine current TCP/IP connections and diagnose hanging connections.
- Employ nbtstat when facing trouble accessing resources via NetBIOS names over a TCP/IP network.
Network Activity Statistics
- Execute netstat -s for detailed statistics of network activity across TCP, UDP, and IP.
- netstat -r displays the routing table, offering insights into traffic paths within the network.
- For open connections, netstat -a reveals all active connections and listening ports.
MAC Address and ARP
- The command arp -a lists MAC addresses associated with IP addresses contacted by the local workstation.
- arp displays current ARP cache entries, mapping network addresses to hardware addresses.
Practical Applications and Utilities
- For a newly installed Windows Server facing connectivity issues, check default gateway configuration using ipconfig.
- In scenarios where a Linux server cannot connect to a Windows Server across the Internet, traceroute can effectively identify where the break in connectivity occurs.
Example Connection States
- Analyzing active TCP connections through netstat can indicate issues like TIME_WAIT or CLOSE_WAIT states that affect future connections and overall performance.
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