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System & Network Engineer Interview Question and Answer

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1. How Many Layers are There in an OSI Reference Model? Name them. Ans. There are 7 Layers in an OSI (Open Systems Interconnection) Reference Model. They are: (1)   Physical Layer (2)   Data Link Layer (3)   Network Layer (4)   Transport Layer (5)   Session Layer (6)   Presentation Layer (7)   Application Layer 2. How Many Types of Network ? Area Base Network-  LAN, MAN, WAN, CAN, SAN, PAN Architecture Base Network-  Client-Server Network, Peer-to-Peer Network Topology Base Network-  Star, Ring, Bus, Mesh, Tree, Hybrid 3. What is the Difference Between Full Duplex and Half Duplex Devices? Answer: A Full Duplex Device is Preferable, because a Full Duplex Device can Send and Receive Data Packets Simultaneously.  However, with a Half Duplex Device, the Device Must Finish Receiving a Message Before it Can then Send a Message. This can Lead to  Slower Transmission Speeds and Increase Network Latency. 4. How does RIP Differ from EIGRP? RIP and
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Roadmap to Success: Palo Alto ACE

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Roadmap to Success is a  series of posts  designed to help learners better understand certification pathways, career opportunities associated with those certifications, and next steps beyond certification. Palo Alto firewalls have emerged as a real force in the IT industry. As a shocking number of organizations are turning to Palo Alto products to improve security, the Palo Alto Accredited Configuration Engineer (ACE) has become a highly sought after certification for employers. Roles for which the ACE is valuable include network security administrator, firewall administrator, network security engineer, and more. Palo Alto Accredited Configuration Engineer (ACE) The  Palo Alto Accredited Configuration Engineer (ACE)  certification is designed to test learners’ knowledge of the core features and functions of Palo Alto next-generation firewalls. The primary goal of the ACE exam is to serve as an objective indication of a learner’s ability to configure Palo Alto Networks firewa
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Importanat 100 questions and answer for job interview IT Professional

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Q1. What is public IP address? Ans. A public IP address is an address leased from an ISP that allows or enables direct Internet communication. Q2. What's the benefit of subnetting? Ans. Reduce the size of the routing tables. Reduce network traffic. Broadcast traffic can be isolated within a single logical network.Provide a way to secure network traffic by isolating it from the rest of the network. Q3. What are the differences between static IP addressing and dynamic IP addressing? Ans. With static IP addressing, a computer (or other device) is configured to always use the same IP address. With dynamic addressing, the IP address can change periodically and is managed by a centralized network service Q4. What is APIPA? Ans. Automatic private IP addressing (APIPA) is a feature mainly found in Microsoft operating systems. APIPA enables clients to still communicate with other computers on the same network segment until an IP address can be obtained from a DHCP server, allowing t
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Router interfaces

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Management Ports Routers have physical connectors that are used to manage the router. These connectors are known as management ports. Unlike Ethernet and serial interfaces, management ports are not used for packet forwarding. The most common management port is the console port. The console port is used to connect a terminal, or most often a PC running terminal emulator software, to configure the router without the need for network access to that router. The console port must be used during initial configuration of the router. Another management port is the auxiliary port. Not all routers have auxiliary ports. At times the auxiliary port can be used in ways similar to a console port. It can also be used to attach a modem. Auxiliary ports will not be used in this curriculum. The figure shows the console and AUX ports on the router. Router Interfaces The term interface on Cisco routers refers to a physical connector on the router whose main purpose is to receive and forward packets. Rout
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