Troubleshooting Networks
Use this command to test a network devcie connectivity.
What is ping?
Use this to segment your network into smaller subnets for easier network management and smoother performance.
What is a VLAN?
Set this up in DHCP, so your network devices always have the same IP address.
What is a reservation?
Use this type of cabling in industrial areas where heavy machinery generates significant electromagnetic interference (EMI).
What is UTP (shielded twisted pair cabling)?
Use this command to show VLAN information?
What is show Vlan?
You are troubleshooting a failed cable. Using your cable tester, you see that two or more of the copper wires are crossed.
What is a cross pair?
This link-state routing protocol, commonly used within autonomous systems, calculates the shortest path based on assigned cost for each link.
OSPF (open shortest path first)
Allows a source device to send a single packet to a specific group of listening devices. Uses class D addressing.
What is Multicast?
This removes the need for separate electrical wiring, allowing devices like IP cameras and VoIP phones to receive through the network cabling.
What is PoE?
This command displays MAC address and port matching on a switch.
What is the show mac-address-table command?
You suspect that unauthorized streaming services might be consuming bandwidth. Use this to monitor the network traffic to resolve the issue without disrupting normal traffic.
What is Port Mirroring?
In networking, this technique combines multiple physical links into a single logical link to increase bandwidth and provide redundancy.
What is Link Aggregation?
In networking, this protocol is responsible for mapping an IP address to a MAC address.
What is ARP? (Address Resolution Protocol)
Your office has a network outage. There are construction workers on site remodeling the office. What could be the cause of the outage?
What is an open circuit?
Use this command to display the device's current configuration.
What is show configuration?
You want to secure your switch, so you configured it with a list of approved MAC addresses.
What is Port Security?
In a Windows system, this tool shows the number of hops, the IP address of the router, and the response time to each probe in milliseconds.
What is tracert?
What is the broadcast address associated with the host located at 10.10.10.0/25?
What is 10.10.10.127?
Often used for backbone cabling in office networks, this standard is used for short-distance runs.
What is MMF ?
Use this command to check whether your switch interface is up or down.
What is show interface?
Two clients on the network are experiencing intermittent activity when accessing the server. No other clients are having this issue.
What is a duplicate IP address?
In networking, this protocol is used to discover neighboring network devices. It can be used with any vendor.
What is Link Layer Discovery Protocol?
This is the maximum number of hosts for a subnet mask of 255.255.255.224
What is 30?
Subtract 224 from 256 = 32
Subtract 2 for the network ID and broadcast domain.
This occurs when a twisted pair of cabling becomes worn, and damaged. The twist may begin to unravel.
What is Crosstalk?
The transfer of signal from one wire to another wire.
Use this command to display the current routing table for a given network device.
What is show route?