Q: Which Is Worse In Terms Of Firewall Detection And Why A False Positive Or A False Negative
A: A false negative is worse by far. A false positive is simply a legitimate result that just got incorrectly flagged. While its irksome, its by no means fatal or difficult to correct. But a false negative means that something bad has slipped through the firewall undetected, and that means a host of problems down the road.
What Are The Different Types Of Vpn
Few types of VPN are:
- Access VPN: Access VPN is used to provide connectivity to remote mobile users and telecommuters. It serves as an alternative to dial-up connections or ISDN connections. It is a low-cost solution and provides a wide range of connectivity.
- Site-to-Site VPN: A Site-to-Site or Router-to-Router VPN is commonly used in large companies having branches in different locations to connect the network of one office to another in different locations. There are 2 sub-categories as mentioned below:
- Intranet VPN: Intranet VPN is useful for connecting remote offices in different geographical locations using shared infrastructure with the same accessibility policies as a private WAN .
- Extranet VPN: Extranet VPN uses shared infrastructure over an intranet, suppliers, customers, partners, and other entities and connects them using dedicated connections.
What Is Multicast Routing
Multicast routing is the routing of packets sent to a multicast address rather than to a single host or a broadcast address. This is similar to how unicast routing works, except that hosts within a multicast group have a single multicast address that many hosts can share instead of every host having its own unicast address. Multicast routing is helpful in cases where messages are sent from a source to multiple receivers.
Please Explain The Potential Difference Between The Internet Intranet And Extranet
These terms can be described as a way network applications are being accessed.
Internet – Everyone and anyone around the world can access the applications
Intranet – Only authorized users from the organization can access the application for which it has been built.
Extranet – Selected external users are allowed to use the application which was built for the Internet
What Is The Netstat Command
Netstat is a command-line utility. It is used to display the status of TCP connections, including the state of the connection, the amount of data transmitted, the hosts address, the port number, and the protocol. Netstat has lots of information to offer you can do netstat help on the windows command prompt to get the list of all helpful netstat commands.
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What Is Nos In Computer Networking
- NOS stands for Network Operating System. It is specialized software which is used to provide network connectivity to a computer to make communication possible with other computers and connected devices.
- NOS is the software which allows the device to communicate, share files with other devices.
- The first network operating system was Novel NetWare released in 1983. Some other examples of NOS are Windows 2000, Windows XP, Linux, etc.
What Is A Tcp Three
A TCP three-way handshake process allows a client and server to open a reliable connection before the actual data communication process starts. In a three-way handshake, the client sends an SYN packet, which is replied to by a server through SYN-ACK, and then finally client sends back an ACK packet.
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What Are The Equivalent Layers Of The Tcp/ip With The Osi Reference Model
- The TCP/IP Application layer is mapped to Session Layer, Presentation Layer, and Application Layer of OSI model.
- The TCP/IP Transport layer is mapped to the Transport Layer of the OSI model.
- The TCP/IP Internet layer is mapped to the Network Layer of the OSI model.
- The TCP/IP Network, Access layer, is mapped to the Data Link Layer and Physical Layer of OSI model.
Explain Differential Backup Vs Incremental Backup
The fundamental distinction between incremental and differential backups is that incremental backups save space and time by simply saving modified data. Incremental backups, on the other hand, are not as effective as differential backups. Let’s discuss Full Backups before diving into the distinctions between Incremental and Differential backups. A full backup is the launching point in both incremental and differential backup schemes in their most basic form. Of course, a complete backup backs up all the information on a partition or disc by copying all data-containing disc sectors to the backup image file.
An incremental backup is a copy of any data that has changed since the last backup. As a result, if you make a full backup of your system on Sunday, an incremental backup on Monday will only transfer and save data that has changed or been added since Sunday. On Tuesday, an incremental backup will only deal with data that has changed since Monday’s incremental backup, and so on. The differential backup, unlike an incremental backup, only backs up data that has changed since the last full backup.
The difference between incremental backup and differential backup is given in the table below:
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Q: Which Is The Better Security Measure Https Or Ssl
A: HTTPS is HTTP combined with SSL, encrypting a users browsing activity and making it safer. SSL is a protocol that protects Internet conversations between two or more parties. Though its close, SSL wins out in terms of sheer security, though any of these are valuable things to know for the purposes of web development.
Discuss The Best Network Troubleshooting Practices
It is also crucial to have some best practices in place to make troubleshooting as speedy and painless as possible. Following these best network troubleshooting practices as you strive to resolve network issues will help speed up the process and minimise superfluous or repeating efforts.
SolarWinds® Network Performance Monitor is my preferred monitoring software . It’s a well-designed application with capabilities that help you debug network issues quickly and thoroughly. NetPath network path analysis, which shows your network topology and performance pathways, and PerfStack, which enables you to compare multiple performance measures against each other as well as historical data, are two more NPM capabilities. You can use these tools to see which performance issues are linked and troubleshoot the root cause more quickly.
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What Is A Switch Or More Specifically Ethernet Switch
Any device that forwards frames based on their Layer-2 MAC addresses using Ethernet. While a hub repeats all frames to all ports, an Ethernet switch forwards frames only to the ports for which they are destined. An Ethernet switch creates a collision domain on each port, while a hub generally expands a collision domain through all ports.
Tell Me Something About Vpn
VPN or the Virtual Private Network is a private WAN built on the internet. It allows the creation of a secured tunnel between different networks using the internet . By using the VPN, a client can connect to the organizations network remotely. The below diagram shows an organizational WAN network over Australia created using VPN:
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What Is A Gateway Is There Any Difference Between A Gateway And Router
A node that is connected to two or more networks is commonly known as a gateway. It is also known as a router. It is used to forward messages from one network to another. Both the gateway and router regulate the traffic in the network.
Differences between gateway and router:
A router sends the data between two similar networks while gateway sends the data between two dissimilar networks.
What Is The Criteria To Check The Network Reliability
Network reliability: Network reliability means the ability of the network to carry out the desired operation through a network such as communication through a network.
Network reliability plays a significant role in the network functionality. The network monitoring systems and devices are the essential requirements for making the network reliable.The network monitoring system identifies the problems that are occurred in the network while the network devices ensure that data should reach the appropriate destination.
The reliability of a network can be measured by the following factors:
- Downtime: The downtime is defined as the required time to recover.
- Failure Frequency: It is the frequency when it fails to work the way it is intended.
- Catastrophe: It indicates that the network has been attacked by some unexpected event such as fire, earthquake.
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Network Troubleshooting Interview Questions
The network troubleshooting interview questions are a sample from the below ebook 250+ Network Engineer Interview questions and answers
A computer is connected to the internet via an ADSL router. The ADSL router is configured with appropriate DNS server IP address. Is it required to configure the DNS server IP address on the computer as well for internet access.
It is required for the DNS server IP address to be configured on the computer. Take an example, where the user wishes to browse a website. When the user opens the browser and types the URL name of the website, a DNS resolution has to take place, for which the URL name has to be sent to a DNS server. The PC has to initiate the DNS request, for which the DNS server IP address has to be configured on the PC. If not configured, the DNS request would fail as the PC would be unaware of DNS server IP address and internet access would fail.
An administrator of an organization is unable to telnet to a router, which is 10 hops away from the admin PC. What tool can be used to identify the location where the connection is dropped.
The admin can use traceroute command line tool to the router and check the location where the packets are being dropped.
A PC which is connected to switch port 23. The switch has learned the mac- address of the PC. The port is now shutdown. Will the switch retain the mac- address ?
Networking Troubleshooting Interview Questions
- Define backbone network.
A design to distribute data and different routes to various networks which is a centralized infrastructure is known as a backbone network.
The network connection between two or more networks or computers placed physically close to each other is called a LAN. It stands for local area network. There are two types of LAN:
- Client-server LAN: In this, a LAN is set up between a server and many different clients. The server has all the information which is passed to the clients.
- Peer to peer LAN: In this LAN, all computers are treated equally connected in a network. No computer is on a higher or a lower level.
- Define data encapsulation.
The transmission of smaller manageable chunks of big data across a network is done through data encapsulation. The header in this process contains the source and destination address along with the parity check. The implementation details of this mechanism are hidden to the user of a class. By executing special functions, a restricted set of operations can be performed on the hidden members of the class. These special functions are known as methods.
- Define network topology along with its types.
In a communication network, the arrangement of the elements is defined by the network topology. In simpler terms, it defines how the physical arrangement is made along with its connection. There are various types of topologies, but some of them are more common and listed below:
- Define NOS and DoS.
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What Skills Should An Ethical Hacker Possess
Professionals starting a career as an ethical hacker are recommended to have a bachelors degree in computer science, information technology, or related field. They should have good coding skills, advanced knowledge of networking systems and security software, various ethical hacking tools, and technical expertise in routers, firewalls, encryption, and virtualization. You can develop these skills and more with our CEH certification program.
What Are The Major Industries In Atlanta
The major industries in Atlanta are logistics, film/television, media and communication, finance, biomedical, health care, etc. A CEH ethical hacking certification course in Atlanta will provide you with a promising career opportunity in any of these industries, as every other nowadays wants to safeguard confidential data.
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+ Top Network Troubleshooting Interview Questions And Answers
Q1. A User Is Able To Ping Ip Addresses On The Internet , But Unable To Access It Via Domain Names. Should The Dns Server Be Configured On The Gateway Or The Client.
The DNS server can be a public server or the gateway address. If it is the gateway address, the DNS server address should be configured on the gateway. The DNS server should also be configured on the users TCP/IP adapter.
Q2. What Is The Difference Between Physical Address And Logical Address?
Physical Address: Its called as MAC Address
Logical Address : Its Called as Ip Address
Q3. What Are The Types Of Lan Cables Used?
Q4. What Is A Cross Cable?
Its used to connect same type of devices without using a switch/hub so that they can communicate.
Q5. How Would You Troubleshoot Dhcp Server Related Issues.?
Check the IP connectivity with the DHCP server from a system configured on the network. Test if the DHCP client and server service is started on the DHCP server and the client. Test if the DHCP server service is reachable using nmap.
Q6. What Is Ipconfig Command? Why It Is Used?
IPCONFIG command is used to display the IP information assigned to a computer.
From the output we can find out the IP address, DNS IP address, gateway IP address assigned to that computer.
Q7. What Would You Use To Connect Two Computers Without Using Switches?
Q8. What Is The Difference Between Public And Private Ip Addresses?
Public IP addresses:
Private IP addresses:
First IP in block Last IP in block
Network Technician Interview Questions And Answers
Learn what skills and qualities interviewers are looking for from a network technician, what questions you can expect, and how you should go about answering them.
If youre looking for a career in the technology industry thats always in high demand, network technician may be the perfect job for you. Network technicians are responsible for installing, maintaining, and repairing computer networks across a variety of industries.
Since there are a variety of positions open in this field, from entry-level to management level, youll want to be prepared for a range of questions in your interview. In this guide, well help you answer some of the most common network technician interview questions.
Are you familiar with the OSI model?
The Open Systems Interconnection model is a networking framework that describes how data moves from one computer to another. The OSI model has seven layers, and the interviewer may ask you this question to see if you have experience working with each layer of the OSI model. You can answer this question by describing your familiarity with the OSI model and which layers you are most comfortable working with.
What are the different types of topologies?
How would you troubleshoot a network with a slow connection?
What is the difference between a switch and a hub?
Provide an example of a time when you had to help a user with a technical issue.
If you were to design a network from scratch, what would be your priorities?
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How To Determine The Ip Class Associated With A Specific Ip Address
You can determine the class of an IP address by looking at the first octet. If the first octet of the address begins with a 0, it is a Class A address. If the address starts with bit 10, it is a Class B address. If it starts with 110, it is a Class C network.
- Class A: 10.0.0.0 10.255.255.255
- Class C: 192.168.0.0 192.168.255.255
What Are The Benefits Of Address Sharing
Address sharing is done through NAT , and it allows multiple inside hosts to share the same Public IP address. You need a special device capable of doing NAT, for example, a router or a firewall. Address translation not only saves Public IP addresses but also has an inherent security benefit compared to routing. Thats because servers on the Internet can only see the public IP address of the external interface of the firewall, not the hosts private IP address behind it. The firewall has an inbuilt NAT table for address translation which maps public ip addresses and ports with Private IP addresses and ports of every connection.
What Is One Basic Requirement For Building Vlans
Without VLANs , a network switch has a single broadcast domain. This also means you can use only one subnet through that switch. By building VLANs, you can break a single broadcast domain into multiple broadcast domains and use multiple subnets through a single switch.
VLANs also enhance security because you can isolate or restrict certain communication between hosts on different network segments.
VLANs divide a big broadcast domain into smaller, manageable, more secure domains.
Mention Some Common Networking Issues
Some common networking issues are:
- Problem with the cable: The cable that connects two devices can become defective, shorter, or physically damaged.
- Connectivity Issue: The port or interface to which the device is attached or configured may be physically down or malfunctioning, preventing communication between the source and destination hosts.
- Incorrect configurations: Network faults and service disruptions can occur as a result of incorrect configuration, IP looping, routing problems, and other configuration difficulties.
- Software Issue: The transmission of IP data packets between the source and destination is disrupted due to software compatibility difficulties and version mismatches.
- Traffic overload: When a network or a network node is overburdened with data, this is known as network congestion. Every network has a limit on the amount of data it can manage. This capacity establishes a limit on how much bandwidth and traffic your network can handle before performance suffers.
- Network IP problems: The source will be unable to reach the target IP over the network due to poor configuration of IP addresses, subnet masks, and routing IP to the next hop.
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