5.5 Given a scenario, troubleshoot common network service issues. Flashcards
A systems administrator setting up a virtual machine (VM) notices the VM has a duplicate Media Access Control (MAC) address as another VM on the same virtual host. The admin discovered this after running the ipconfig/all command. Which issue is possible when the VM is connected to the virtual switch (vSwitch)?
Unable to perform name resolution.
Unable to maintain zero packet loss.
Unable to route to other networks.
Unable to use network services.
Unable to maintain zero packet loss.
Packet communications will be split in half between both duplicate MAC addresses. A duplicate MAC (Media Access Control) address, even in a virtual environment, will cause significant packet loss. This is especially true when both virtual machines (VMs) are on the save virtual switch (vSwitch).
A network admin notices network congestion affecting two web servers configured for load balancing. Users are experiencing slow download times and periodic web service interruptions. Identify which examples could cause network congestion and affect web services. (Select all that apply)
An exhaused DHCP (Dynamic Host Configuration Protocol) scope
Misconfigured ACL (Access Control List)
A broadcast storm
Denial of Service attack
A broadcast storm
Denial of Service attack
A broadcast storm caused by switching loops will cause loss of network bandwidth. This will cause congestion for services on the same network.
A Denial of Service (DoS) attack can cause network congestion by resource exhaustion. One example is when multiple bot computers try to connect to the web server at the same time.
A new application on a client workstation is unable to communicate out to the Internet. Vendor support has stated the application uses common Transmission Control Protocol (TCP) port 443 for secure access to their public web services. The client can still browse the Internet via Internet Explorer. Determine why the application is unable to communicate with the vendor’s public services.
The client is unable to reach default gateway.
The firewall rule for the application is disabled.
Vendor services are not working.
The firewall is blocking TCP port 443.
The firewall rule for the application is disabled.
A new packet filtering firewall recently deployed onto the internal network and internal web services suddenly stopped working. Consider relevant firewall components to select the likely cause of the issue.
Misconfigured host-based firewall rules
Misconfigured ACL (Access Control List) settings on network firewall
Stopped web services
Device certificate is not trusted
Misconfigured ACL (Access Control List) settings on network firewall
A new packet filtering firewall requires several fine tunings to ensure all legitimate traffic can go in and out. The web server may require more open ports on the firewall for specific services.
