CertMaster Network+ Lesson 1 Review

Which of the following sets correctly represents the possible values that can be represented by each digit in hexadecimal notation?

0 through 9 and A through F

When troubleshooting network issues using the CompTIA Network+ troubleshooting method, it's important to carry out tasks in a specific order. Drag each trouble shooting task on the left to the correct step on the right.

1. Identify the problem. 2. Establish a theory of probable cause. 3. Test the theory to determine the cause. 4. Establish a plan of action. 5. Implement the solution or escalate. 6. Verify full system functionality. 7. Document findings, actions, and outcomes.

Match each decimal value on the left with the corresponding hexadecimal value on the right. Not all decimal values have a corresponding hexadecimal value.

11 -> 17 B -> 11 D -> 13 F -> 15 C -> 12 10 -> 16

A small office/home office (SOHO) network is configured to use the private IP address range of 192.168.1.0/24. If you are setting up a SOHO router for this network, which of the following IP addresses would be the MOST appropriate for the router?

192.168.1.1

What is the decimal form of the following binary IP address? 11001101.00111001.10101001.01000010

205.57.169.66

What is an 8-bit value commonly called? (Select two)

A byte An octet

What is a Protocol Data Unit (PDU)?

A chunk of data with protocol-specific headers added at each OSI layer

Which of the following BEST describes a SOHO (Small Office/Home Office) network?

A network in a single location with a small number of computing hosts, typically relying on a single integrated appliance for local and Internet connectivity

Which of the following BEST describes a datagram used in Network layer (Layer 3) of the OSI model?

A self-contained packet that is sent over a network without the need for pre-established paths or sessions

In a network setup, which components are essential for performing specific roles and configuring additional properties for different functions? (Select two.)

Appliances Functions

Match each networking function or device on the left with its associated OSI model layer on the right.

Application layer -> HTTP Presentation layer -> Translates data Session layer -> Session ID Number Transport layer -> Port Number Network layer -> Router Data Link layer -> Switch

When troubleshooting a software issue reported by a user who is unfamiliar with technical terms, which type of question is MOST effective to begin the diagnostic process?

Asking them to describe what they were doing when the issue occurred

At layer 4 of the OSI model, how is each application identified to facilitate proper routing and delivery of data?

By a unique port number assigned to the application

What is the MOST effective method for protecting the management interface of a SOHO router?

Configuring a strong administrative account passphrase

What is the recommended action when applying a solution that is disruptive to the wider network during troubleshooting?

Consider the most appropriate time to schedule the reconfiguration work and plan how to notify other network users.

You are a support technician at a medium-sized company. One morning, you receive a call from a user in the accounting department who reports that their financial reporting software, which has been running smoothly for months, suddenly won't start. You remember that the software received an update over the weekend. Based on this scenario, which of the following actions would be most appropriate to take first in order to identify the cause of the problem?

Determine what changes have occurred since the software was last working, specifically asking about the recent update.

You have a network that's connected using a full physical mesh topology. The link between Device A and Device B is broken. Which of the following BEST describes the effect that this will have on network communications?

Device A will be able to communicate with all other devices.

A help desk operator is troubleshooting a site that is no longer responsive. Which of the following is the last step the operator should perform?

Document findings

Which of the following statements accurately describe characteristics of the decimal numbering system? (Select two.)

Each digit can have one of ten possible values. A digit positioned to the left of another has 10 times the value of the digit to the right.

Which of the following networking terms refers to the nodes that send and receive data traffic?

End systems

You are a help desk technician for a software company, and you receive a call from a customer who is experiencing issues with a third-party application that is not supported by your company. Despite explaining the situation and attempting to provide general advice, the customer becomes increasingly difficult and abusive, insisting that your company should resolve their issue. Your attempts to calm the situation and explain the limitations of your support have not been successful, and the customer's behavior is escalating. Considering your company's policies and the need to maintain a professional environment, what should be your next step?

Escalate the call to a manager or a customer success team who is trained to handle difficult situations.

A system administrator is reviewing an alert for the firewall. There was an alert that a piece of malware was downloaded to a computer on the network. The system administrator followed through by checking to make sure that the malware was downloaded. Which of the following steps should the sysadmin do next to help mitigate this in the future?

Establish a plan of action.

A system that contains custom applications routinely crashes. IT decides to upgrade the operating system after speaking with application support personnel, and testing the problem. What should IT do next to troubleshoot the issue?

Establish a plan of action.

Before escalating a troubleshooting problem, what should you be able to do? (Select two.)

Establish the basic facts surrounding the problem. Be able to communicate the basic facts clearly to the person to whom you are referring the incident.

Which of the following functions does a SOHO router implement at layer 2 to make use of its Physical layer adapters? (Select two.)

Ethernet switch Wireless access point

A user is unable to print to a network printer. Which of the following is the first step that a technician should take to troubleshoot the issue?

Identify the problem.

When troubleshooting network issues, what is the first step to resolving it?

Identify the problem.

Which of the following MOST correctly describes using the divide and conquer approach of the OSI model for troubleshooting network issues?

Identifying the most likely layer causing the issue based on symptoms and preliminary information, then working either up or down the OSI model as needed to isolate and resolve the problem

How is identifying the location and scope of a problem helpful in the troubleshooting process? (Select two.)

It helps identify the source of the problem. It helps prioritize the problem in relation to other incidents.

A communications engineer notices that every time it rains the signal becomes very degraded. Which layer of the OSI model is the engineer most likely troubleshooting?

Physical

Which Open Systems Interconnection (OSI) model layer is responsible for the transmission of bits of data?

Physical

Which of the following BEST describes the role of port numbers in the multiplexing of packets at the Transport layer?

Port numbers are used to identify the type of network application and facilitate the multiplexing of packets onto the same link.

You have recently moved to a rural area and the only available internet service is through a Digital Subscriber Line (DSL). You've purchased a SOHO router to set up your home office network. To connect your SOHO router to the DSL internet service provided by your ISP, which port on the SOHO router should you use?

RJ-11 port

Which of the following functions are performed by the OSI Transport layer? (Select three.)

Reliable message delivery End-to-end flow control Data segmentation and reassembly

A systems manager is preplanning for an event where critical servers might fail. Which of the following would be the most likely plan of action?

Replace

A freelance photographer is setting up a home office. They need to connect a desktop, a laptop, a network printer, and occasionally, guests' devices to the Internet and to each other for file sharing and printing. Which type of network is MOST suitable for this scenario?

SOHO (Small Office/Home Office) Network

Which of the following are layers of the OSI reference model? (Select three.)

Session Layer Application Layer Presentation Layer

As a networking consultant, you are helping a small business owner to set up a network for their office. The office has 10 employees, each with a computer, and they also have a centralized server, a printer, and an Internet router. Which type of network would be MOST suitable for this setup?

Small Office/Home Office (SOHO) network

A growing company has recently moved into a new office space. The company has 50 employees, each with their own workstation. The office also has multiple printers, a centralized server, and requires structured cabling for connectivity. Which type of network would be MOST effective for this setup?

Small and Medium-sized Enterprise (SME) network

Which of the following statements are true about Requests for Comments (RFCs)? (Select two.)

Some RFCs are designated informational or experimental. An older RFC is never updated; a new RFC is published with a new number if changes are required.

Which of the following networking topologies connects each network device to a central forwarding appliance?

Star

When you have diagnosed the symptoms of a network issue and know what is likely causing them, what should you do next?

Test each possible cause until you find the right one.

A multinational corporation has its main office in New York and branch offices in London, Tokyo, and Sydney. The corporation needs a network that can connect all these offices together, allowing for seamless communication and data transfer. Which type of network would be MOST suitable for this setup?

Wide Area Network (WAN)

A network engineer is designing a network in various offices to create multiple broadcast domains. Each has its own Virtual Local Area Network (VLAN). When configuring these multiple broadcast domains on the switch, the switch will be operating at what layer of the OSI model?

Layer 2 (Data Link Layer)

A team of network consultants is configuring an Internet of Things (IoT) network. The team is considering network topologies in the context of the IoT devices being used, which are all within 100 meters of one another, are battery-powered, and communicate via the Zigbee protocol. Which of the following network topologies would BEST save power and scale easily to thousands of IoT sensor devices while saving power by cooperating with nearby devices?

Mesh

You've implemented an ad hoc wireless network that doesn't employ a wireless access point. Every wireless network card can communicate directly with any other wireless network card on the network. Which type of physical network topology have you implemented in this network?

Mesh

Your manager has asked you to implement a network infrastructure that will accommodate failed connections. Which of the following network topologies provides redundancy for a failed link?

Mesh

You are a network administrator for a large organization. One morning, you receive reports from several departments that users are experiencing intermittent network connectivity issues. The symptoms include slow internet speeds, inability to access network drives, and occasional disconnections from the email server. Given the variety of symptoms and the fact that they are affecting multiple departments, you decide to troubleshoot the issue. In this scenario, what is the BEST approach to begin troubleshooting the network connectivity issues?

Methodically prove the functionality of each component in the network system, starting from the user access layer and moving towards the core network infrastructure.

Which of the following devices operate at the Data Link layer of the OSI model? (Select three.)

Network interface cards (NICs) Bridges Switches

A network architect is reviewing a network where application services and resources are centrally provisioned, managed, and secured. What is this type of network called?

Client server

When troubleshooting a problem, which of the following are typical solutions? (Select three.)

Accept Replace Repair

You manage a network that's connected using a physical star topology. One of the drop cables connecting a workstation has been removed. Which of the following BEST describes the effect that this will have on network communications?

All devices except the device connected with the drop cable will be able to communicate.

As the IT support specialist for a small company, you are approached by an employee who complains that they can't connect to the Internet. Preliminary checks show that the issue is isolated to this single workstation. Other devices on the same network are connecting without any issues. You decide to employ the bottom-to-top OSI model approach to systematically troubleshoot and resolve the problem. Using the bottom-to-top OSI model approach, which of the following steps should you take first to troubleshoot the internet connectivity issue on the employee's workstation?

Check the Ethernet cable and the network interface card (NIC) for any physical damage or disconnection.

Which of the following organizations are responsible for the development of the Internet and agreeing on common standards and protocols? (Select two.)

Internet Assigned Numbers Authority (IANA) Internet Engineering Task Force (IETF)

When the Data Link layer performs encapsulation, it adds control information to the payload in the form of header fields. Which of the following are header fields added by the Data Link layer during encapsulation? (Select three.)

Destination hardware address Source hardware address Checksum for basic error checking

What role does the WAN interface play in network security?

It acts as the network perimeter, applying filtering rules to traffic between public and private zones.

What should you do when you discover symptoms of more than one problem while investigating a user's system issue?

Treat each problem as a separate case, even if they seem related.

When troubleshooting requires a change to the system or the network environment, what is MOST likely to be recommended as a course of action?

Following a change management plan

When referencing network topologies, what distinguishes half-duplex from full-duplex communication in a point-to-point link?

Half-duplex allows for data transmission in both directions, but not simultaneously; full-duplex permits simultaneous two-way data transmission.

To fully solve a problem, what proactive step should be taken?

Try to eliminate any factors that may cause the problem to recur.

You are a network technician troubleshooting a connectivity issue in your company's network. After identifying the problem and establishing a theory of probable cause, you have successfully tested your theory and determined the cause of the issue. You have just finished establishing a detailed plan of action to resolve the problem, which includes replacing a faulty network switch that has been causing intermittent connectivity issues for several users. What is the next step you should take according to the CompTIA Network+ troubleshooting methodology?

Implement the solution by replacing the faulty network switch.

You are the lead network engineer responsible for maintaining the network infrastructure of a large enterprise. One day, you receive reports that a specific department is experiencing intermittent network connectivity issues. This problem affects various applications and services, including email, web browsing, and internal database access. After a preliminary investigation, you find no immediate issues with the network hardware or server configurations. Given the intermittent nature of the problem and its impact on multiple services, you decide to employ the divide and conquer approach of the OSI model to efficiently troubleshoot and identify the root cause of the connectivity issues. Using the divide and conquer approach of the OSI model, which of the following steps should you take first to troubleshoot the intermittent network connectivity issues affecting the department?

Inspect the configuration of the routers and switches to ensure they are correctly routing and switching packets.

A network technician wants to create efficiencies in network traffic by implementing a device which applies microsegmentation by establishing a point-to-point link between any two network nodes. Which of the following should they implement?

Layer 2 switch

A security engineer configures software-based port security on a hardware firewall. Which OSI model layer identifies the application ports to configure?

Layer 4

Which of the following geographic network types is typically confined to a single geographical location where all nodes and segments are directly connected?

Local area network (LAN)

Your company has a network where all devices can communicate with each other as if they were directly connected, regardless of the physical connections. What type of network topology does this describe?

Logical topology

An engineer uses a type of network adapter to connect a fiber link to a router. The transceiver fits into an optical interface on a layer 3 Ethernet router. Of the choices, which layer 1 implementation does the engineer utilize?

Media converter

You own a small business and have decided to set up a network where each computer acts as both a client and a server. This decentralized model should allow for the provisioning, management, and security of services and data that you want distributed around the network. What type of network would BEST meet your requirements?

Peer-to-Peer network

How are packets forwarded at the Layer 3 (Network layer) of the OSI model?

Packets are forwarded based on their destination network address.

What role does the Presentation layer (layer 6) of the OSI model play in terms of data compression and encryption?

The Presentation layer supports data compression and encryption to prepare data for network transmission.

Which of the following statements accurately describes the function of the Session layer (layer 5) in the OSI model?

The Session layer administers the process of establishing, managing, and terminating a dialog between client and server.

At Layer 4 of the OSI model, which mechanism is responsible for ensuring reliable data delivery between hosts?

The implementation of flow control and error-checking protocols

Which of the following BEST describes a demarcation point in the context of telecommunications?

The point at which the telco's cabling enters the customer premises

In the OSI model, what is the primary function of the Network layer?

The primary function of the Network layer is to move data around an internetwork using logical network and host IDs.

What is the primary purpose of data encapsulation in network protocols?

To add additional data headers for routing and delivery

What is the role of an Access Control List (ACL) at Layer 3 (Network layer) of the OSI model?

To filter network traffic by permitting or blocking packets based on IP addresses and other criteria

What is the primary purpose of the routing part of the SOHO router at the Network layer?

To make forwarding decisions between the local private network and the public Internet

When verifying a solution to a reported problem, what is the primary goal?

To validate that the solution fixes the reported problem without affecting the system's overall functionality

What do Internet Service Providers (ISPs) use to establish links between their networks within an Internet eXchange Point (IXP) data center?

Transit and peering arrangements

A systems administrator wants to ensure that port numbers are being appropriately assigned for each type of network application. What layer of the OSI model should the administrator be reviewing to ensure these actions are taken?

Transport

A network administrator notices that communication to a particular node in a star topology network consistently fails. The node is located at a significant distance from the central switch, further than any other node on the network. The administrator suspects that the distance may be causing signal degradation. What is the MOST appropriate solution to resolve this issue?

Use a repeater to strengthen the signal over the extended distance.

How is SOHO subscriber Internet access PRIMARILY facilitated?

Via the public switched telephone network (PSTN)

Which of the following interfaces does a SOHO router provide at the Physical Layer of the OSI model? (Select three.)

WAN port for Internet Service Provider (ISP) connection RJ-45 ports for a local cabled network Radio antennas for wireless signal transmission

When trying to identify the cause of a problem, which of the following are key questions to ask? (Select two.)

What has changed since it was last working? Did it ever work?