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From this routing table entry, you know that Ports 1 and 2 represent connections to the router's physical ports. What else do you know from these entries?
Port 1 has a public IP and is likely connected to an ISP; Port 2 has a private IP and is likely connected to a device on the local network
What is the IP address of the device that is translating website names to and from their public IP addresses?
8.8.8.8
How many locked octets does a Class A IP address have?
One
Given a subnet mask of 255.255.255.0, which two IP addresses are on the same network?
192.168.10.25 and 192.168.10.100
Raphael is asked to help Sonia configure her home router. What are some basic steps that Raphael should advise Sonia to do?
Configure WAN/LAN connections, change default password and SSID, and reserve IPs from outside the DHCP pool for devices that need static IPs.
How many bits are in an IPv6 address?
128
Which service uses port 445?
SMB
Why is it necessary to use port numbers when data is being transferred between a client and a server?
Port numbers ensure that data gets to the correct application.
DNS is like a contact list for the internet, converting FQDN (e.g., www.totalsem.com) into a public IP address. How does this work?
The local DNS server connects with a network of authoritative root and domain servers that store this information.
TCP is a connection-based protocol, and UDP is a connectionless protocol. How would you describe each of these behaviors?
TCP requires a connection to be established prior to exchange of data, while UDP allows the transfer of data without any prior connection.
When using nslookup to troubleshoot possible DNS issues, which notification indicates that DNS is down?
DNS request timed out.
What is the maximum number of characters in an FQDN?
255 (including dots)
What are three attributes of IPv6?
It consists of 8 groups of 4 hexadecimal values, it is always a /64 subnet mask, and the notation can be shortened in some cases.
In this IP configuration, which of the IP addresses shown belongs to the router?
192.168.10.1
You are called about a problem and told there are two computers plugged into the same switch, and they cannot see or talk to each other. The first step is to check for the existence of VLANs. Why?
If the ports the computers are plugged into are configured with different VLANs, the computers are on different networks.
Quality of Service (QoS) is a tool set that allows you to meter and adjust bandwidth priority for services using a port number, Mac address, or IP address. Why would you use this setting?
to give bandwidth priority to a particular service, such as gaming or video streaming
Which option is most likely to prevent a device from connecting to a previously-used Wi-Fi network?
The SSID has changed.
How would you describe the difference between public and private IP addresses?
Private IPs are used to address devices on local area networks, while public IPs are used to connect one LAN to another with routers.
What does 255 mean in a subnet mask?
The octet is part of the network address.
Alex is troubleshooting connectivity issues on a wired network and asks you for help. What will you advise him to check first?
cable connections, link lights, and IP addressing
How would you describe the difference between these two configurations?
The left is a static IP configuration, and the right is a DHCP configuration.
Why is network address translation (NAT) so important to networking?
It reduces the number of necessary public IP addresses by allowing local networks to use private IP addresses and share a public IP address.
