CompTIA Network+ 1

Which of the following is a public, routable IP address?

• 172.16.2.243

• 191.192.2.4

• 10.10.10.22

• 192.168.3.2

Answer explanation

The question asks for a public, routable IP address. The correct answer is 191.192.2.4. This is because the other options are private IP addresses. Private IP addresses are not routable on the internet, they are reserved for private networks. On the other hand, 191.192.2.4 is a public IP address, which is routable on the internet.

You create multiple VLANs on a series of interconnected switches. You need to ensure that traffic for all VLANs can be passed between switches. What should you do to meet this requirement?

• Connect switches together on accessports.

• Connect all switches to a layer 3 switch.

• Create an interface for each VLAN all switches. 

• Configure the interconnects as trunk ports.

Answer explanation

To pass traffic for all VLANs between switches, the interconnects should be configured as trunk ports. Trunk ports carry traffic for multiple VLANs over a single link and are typically used to connect switches to other switches. Other options do not ensure that traffic for all VLANs can be passed between switches.

What is the main purpose of a VPN?

• to establish a shared Secret

• to hide private IP addresses

• to allow remote users to connect using a single access point

• to create an encrypted connection over the internet

Answer explanation

The main purpose of a VPN, as per the question, is to create an encrypted connection over the internet. This option is correct because a VPN, or Virtual Private Network, allows for secure, encrypted connections, which helps keep data private when using a public network. It does not primarily establish a shared secret, hide private IP addresses, or allow remote users to connect using a single access point.

Router A has a static routing table and is not configured with a default route. What happens when Router A receives a packet that does not match any routes?

• The router performs a NAT operation.

• The packet is broadcast to all routes.

• The route is chosen randomly. 

• The packet is discarded.

Answer explanation

In the given question, Router A does not have a default route configured and uses a static routing table. When it receives a packet that doesn't match any routes, it has no instructions on where to send it. Therefore, the packet is discarded. This is why the correct answer is 'The packet is discarded.'

Which can a virtual switch use to segment Network traffic at layer 2?

• NIC teaming

• STP

• OSPF

• VLANs

• RIP

Answer explanation

A virtual switch can use VLANs to segment Network traffic at layer 2. VLANs, or Virtual Local Area Networks, allow for the creation of logically separate networks within the same switch, effectively segmenting the traffic. Other options like NIC teaming, STP, OSPF, and RIP do not perform this function at layer 2.

A user brings their laptop to your service desk and reports that the laptop cannot connect to the network. Which action are you MOST likely to perform as part of verifying your theory?

• Search your knowledge base for related issues.

• Determine if the user recently made changes.

• Test connectivity to a remote server with ping.

• Create an image of the laptop's hard drives.

Answer explanation

The correct action to take when a laptop cannot connect to the network is to test the connectivity to a remote server with ping. This will help determine if the issue is with the laptop's network connection or the network itself. Searching the knowledge base or determining if the user made recent changes may not directly verify the network issue. Creating an image of the laptop's hard drives is unrelated to network connectivity issues.

Which topology is the Internet based on?

• Bus

• Mesh

• Star

• Ring

Answer explanation

The Internet is based on a mesh topology. In a mesh network, nodes are interconnected with many redundant interconnections between network nodes. In a true mesh topology every node has a connection to every other node in the network. This design approach is used in the Internet for its high robustness and fault tolerance, which are critical in maintaining the reliability of Internet connections.

What is the IPv6 local loopback address?

• ::1

• FF01::1

• ::

• FF02::1

Answer explanation

The IPv6 local loopback address is represented as ::1. This address is used by a node to send a packet to itself. It is equivalent to the IPv4 loopback address, 127.0.0.1. The other options, FF01::1, ::, and FF02::1, are not used as local loopback addresses in IPv6.

You suspect that a malicious host that an unfamiliar IP address is connected to your server. You need to determine if the connection is active as well as the port being used. Which tool should you use?

• netstat

• arp

• pathping

• tracert

Answer explanation

The correct tool to use when you need to determine if a connection from an unfamiliar IP address is active and the port being used is 'netstat'. This tool provides network statistics and reports on incoming and outgoing network connections, including the IP addresses and ports involved.

What does a layer 2 switch use to direct packets?

• Computer name

• IP address

• MAC address

•  User name

Answer explanation

A layer 2 switch uses a MAC address to direct packets. This is because layer 2 of the OSI model, also known as the Data Link Layer, is responsible for the transmission of data between two nodes connected by a physical layer. It uses MAC addresses to identify devices and direct data packets to the correct destination.