Networking Flashcards
(47 cards)
What causes Network connectivity issues?
Network connectivity issues happen when devices fail to communicate with each other over a network. These issues can manifest as an inability to access the Internet, connect to a shared resource, or communicate between networked devices.
Configuration problems, on the other hand, stem from incorrect settings within network devices or software, leading to improper routing, inaccessible services, or degraded performance. Here are some common causes of network connectivity issues, faulty cables, loose connections, or malfunctioning network interfaces can disrupt communication.
Incorrect IP addresses, subnet masks, or default gateways can prevent devices from finding each other on the network. Also, domain name system or DNS problems can prevent domain names from resolving to their respective IP addresses.
DNS is a hierarchical and distributed naming system used to translate domain names into IP addresses necessary for locating and identifying devices o n the network Furthermore, misconfigured or failing routers and switches can block or misroute traffic, and outdata or buggy software and firmware can introduce connectivity issues.
What are the (3) parts to resolving a gaming performance issues?
-Check the display tab: device info, drivers, DriveX
features, notes
-Update drivers if necessary
-Test the game again
What are (3) reasons for network connectivity issues?
-Misconfigured IP addresses, subnet masks or
gateways
-Incorrect subnet masks can lead to devices being
placed in the network wrong network segment
-The default gateway is critical for directing traffic to
external network
What is Dynamic Host Configuration Protocol (DHCP)?
Dynamic Host Configuration Protocol (DHCP) is a crucial component of network management that automates the assignment of IP addresses to devices on a network. Despite its importance in ensuring smooth and efficient network operations, DHCP can sometimes encounter issues that disrupt connectivity and hinder performance.
What are the (4) aspects to failure to obtain an IP address?
-DHCP server issues
-Signal strength Wifi
-Static IP conflicts
What are (2) causes and solutions to IP address conflicts?
-Duplicate static IP
-Expired DHCP leases
What are (2) tools and commands IP address conflicts?
arp -a is used in Windows in the command prompt to list all IP addresses and their MAC (Media Access Control) addresses on the network and helps you identify conflicts.
Check the DHCP server logs for conflicting IP assignments. The server logs can be accessed from the DHCP Management Console.
What are (2) causes and solutions for DHCP servers not responding?
-Server downtime
-Network configuration: ipconfig /all
What are (2) commands for DHCP servers not responding?
Use the ping command in the command prompt or terminal to test connectivity to the DHCP server.
Review server logs for errors or warnings.
What are (2) advanced troubleshooting techniques for DHCP Network scanning?
Use nmap for comprehensive network scanning and host discovery.
Use arp -a to view ARP cache and identify IP assignments.
What are (2) advanced troubleshooting techniques for DHCP Packet analysis?
Use Wireshark for capturing and analyzing network packets.
Filter DHCP traffic to isolate relevant packets for troubleshooting.
What is one advanced troubleshooting technique for security log analysis?
Review DHCP server logs for lease assignment errors or conflicts.
What are (4) aspects to resolving IP address conflicts?
-Identify conflicted IP addresses: arp -a
-Check DHCP logs
-Assign static IPs carefully
-Adjust DHCP settings
What is the Domain Name System (DNS)?
Domain Name System (DNS) issues can disrupt access to websites and other online resources, even with a functioning internet connection. One common problem is the inability to resolve domain names, which prevents browsers from connecting to websites. This reading explores the causes of DNS resolution failures and provides practical solutions and diagnostic tools to address these issues effectively.
What are the (3) causes and solution of being unable to resolve domain names?
-Incorrect DNS server configuration
-DNS server downtime
-Propagation delays
What are the (3) commands that are unable to resolve domain names?
Use nslookup <domain> to query the DNS server for domain resolution.</domain>
Use dig <domain> for detailed DNS query information.</domain>
Use ping to test connectivity to the DNS server.
What are (3) causes and solutions for a DNS server not responding?
-Server issues
-Firewall settings
-Network issues:
What are (2) tools and commands for a DNS server not responding?
Use tracert <DNS> if you are using your computer to trace the route and identify where the communication fails. Remember to enter the specific DNS server’s details, don't just type "DNS server".</DNS>
Review DNS server logs for indications of failure. To do so, log into the server where the DNS service is running, and locate the directory where DNS server logs are stored. This can vary depending on the DNS server software and configuration.
What are (2) causes and solutions for Incorrect DNS records?
-Manual entry errors
-Expired records
What are (2) tools and commands for Incorrect DNS records?
Use nslookup and dig to verify DNS records.
Check the DNS management console for correct configurations.
What are (3) command-line tools that use diagnostic utilities?
-ipconfig
-dig
-ipconfig
What are (3) aspects to advanced troubleshooting techniques for DNS?
-Network scanning: nmap, arp -a
-Packet analysis
-Server log analysis
What are (5) parts to fixing domain name resolution failures?
-Verify DNS configuration: ipconfig /all
-Query DNS records: nslookup <domain> and dig</domain>
<domain>
-Check DNS server status: ping and tracert
-Update DNS records
-Clear DNS cache: Use ipconfig /flushdns
</domain>
What is Ping?
Ping is used to test the reachability of a host on an IP network, and measure the round trip time for messages sent from the originating host to a destination computer.
