Port Numbers and Protocols
What is TCP and UDP and their Differences?
Transmission Control Protocol (TCP) - Data delivered reliably, assembled in proper order and acknowledging received data.
User Datagram Protocol (UDP) - Data is delivered as quickly as possible with no acknowledgement that the data was received at the destination.
What are the two types of Network Addresses?
Media Access Control (MAC) address and the Internet Protocol (IP) address.
What is an example of a default User Name and Password for routers?
User: Admin
Password: Admin/Password
What is a DMZ and what does it do?
A demilitarized zone (DMZ) is a network that provides services to an untrusted network.
NIC LED lights are not lit.
What is a possible solution?
Reconnect or replace the network connection to the computer.
Replace the NIC.
What are some Email and Identity Management Protocols and their ports?
Give one.
25 - TCP - SMTP
110 - TCP - POP3
143 - TCP - IMAP
389 - TCP, UDP - LDAP
What is the difference between a MAC address and a IP address?
The MAC address is hard-coded onto the Ethernet or wireless network interface card (NIC) by the manufacturer. The address stays with the device regardless of what network the device is connected to.
IP addressing is assigned by network administrators based on the location within the network. When a device moves from one network to another, its IP address will most likely change
How do you gain access to the wireless router's configuration GUI?
Open a web browser and in the address field, enter the default IP address for your wireless router.
What is UPnP and what does it do?
Universal Plug and Play (UPnP) is a protocol that enables devices to dynamically add themselves to a network without the need for user intervention or configuration.
IPv4 address displays 169.254.x.x what is a possible solution?
Reconnect the network cable.
Ensure the router is powered on and is properly connected.
Restart the DCHP server.
Replace the NIC.
What are some World Wide Web Protocols and their ports?
Give one.
53 - TCP, UDP - DNS
80 - TCP - HTTP
443 - TCP, UDP - HTTPS
What is Static Addressing?
In a small network, you can manually configure each device with proper IP addressing. You would assign a unique IP address to each host within the same network.
What command line is used to find more information about your device and the network its connected on?
ipconfig /all
What is it called when you specify which IP addresses are allowed or denied on your network?
Whitelisting and blacklisting.
Users are experiencing slow speeds, weak signal strength, intermittent connectivity on the wireless network.
Give a probable cause and its solution.
Too many users connected to the AP.
-Add another AP or repeater to strengthen signal.
User is too far away from AP.
-Move the AP and ensure it is centrally located.
The wireless signal is experiencing interference from outside sources.
-Change the channels on the wireless network.
What are some File Transport and Management Protocols and their ports?
Give one.
20 - TCP - FTP
21 - TCP - FTP
69 - UDP - TFTP
445 - TCP - SMB/CIFS
548 - TCP, UDP - AFP
What is a DHCP server and what does it do?
A Dynamic Host Configuration Protocol (DHCP) server automatically assigns IP addresses, which simplifies the addressing process.
What is QoS and what is it used for?
Quality of Service (QoS) can guarantee that certain traffic types, such as voice and video, are prioritized over other traffic.
What is a rule-based method of directing traffic between devices on separate networks?
Port Forwarding
An IP address conflict message displays when connecting a new device to the network.
Give a probable cause and a solution.
The same IP address is assigned to two devices on the network.
-Configure each device with a unique IP address.
Another computer has been configured with a static IP address that was already assigned by the DHCP server.
-Configure the DHCP to exclude the static IP address from assignments and reboot all affected devices.
What are some Remote Access Protocols and their ports?
Give Two.
22 - TCP - SSH
23 - TCP - Telnet
3389 - TCP, UDP - RDP
What Link-Local address is automatically assigned to a computer when it cannot communicate with a DHCP server?
Automatic Private IP Addressing (APIPA) address. This link-local address is in the range of 169.254.0.0 to 169.254.255.255.
What is the first thing you should do when first configuring a brand new router?
Change the default administrative password.
What is this method called that allows the router to temporarily forward data through inbound ports to a specific device?
Port Triggering.
You can use port triggering to forward data to a computer only when a designated port range is used to make an outbound request. For example, a video game might use ports 27000 to 27100 for connecting with other players.
The nslookup command reports "Can't find server name for address {ip-address}: timed out" where ip-address can be any IP address.
Give a probably cause and solution.
The DNS server is not responding.
-Resolve connectivity issues to the DNS server and/or restart the DNS server
The DNS records are incorrect.
-Configure the DNS server with the correct records.