Interview Preparation | Network Engineer - Part1
Interview Preparation : Network Engineer
What is router?
Router is a network hardware device that is used to connect two different network. Its work in layer 3 (network layer). The primary function of a router is-two forward the packet from one network to another by choosing a best path. Router manage routing table that contains a lsit of best path. RIP, OSPF, BGP, EIGR, ISIS.
What is swith?
Switch is a network hardware device used to connect host within a network or LAN, and the primary function is-to forwards and send data packet to and from thoese devices. VLAN, VTP, STP, RSTP, Port-Channel, BPDU Guard, BPDU Filter, Port Fast.
What is Firewall.?
A firewall is a network security device that separates a trsuted internet network from an external network deemed untrustworthy, such as the internet. Firewall regulates incoming and outgoing network traffic based on preset security rules.
ACL, NAT, IPSEC, IDS, IPS, SECURITY PROFILE
Technical questions along with brief answers:
1. What is an IP address?
- An IP address is a unique numerical label assigned to each device in a network to identify and locate it.
2. Explain the difference between IPv4 and IPv6.
- IPv4 uses a 32-bit address format, while IPv6 uses a 128-bit address format. IPv6 was introduced to overcome the shortage of available IPv4 addresses.
3. What is a subnet mask?
- A subnet mask is used to divide an IP network into subnetworks by specifying which portion of the address is the network and which is the host.
4. Define MAC address.
- A MAC address (Media Access Control address) is a hardware address that uniquely identifies a device on a local network.
5. What is a router?
- A router is a networking device that forwards data packets between different computer networks.
6. Explain the OSI model and its layers.
- The OSI model is a conceptual framework that standardizes the functions of a telecommunications or networking system. It has seven layers, from Physical to Application.
Here's a breakdown of the seven layers:
A. Physical Layer: Deals with the physical connection and transmission of raw data bits over a medium (e.g., cables, wireless signals).
B. Data Link Layer: Handles error-free transfer of data frames between two directly connected nodes.
C. Network Layer: Responsible for routing data packets across networks using IP addresses.
D. Transport Layer: Provides reliable or unreliable delivery of data segments between applications on different hosts.
E. Session Layer: Manages connections between applications, including establishing, maintaining, and terminating sessions.
F. Presentation Layer: Deals with data formatting, encryption, and compression to ensure data is in a usable format for the application layer.
G. Application Layer: Provides network services to applications, such as email, file transfer, and web browsing
7. What is a firewall?
- A firewall is a network security device that filters incoming and outgoingu network traffic based on an organization's previously established security policies.
8. What is DNS, and how does it work?
- DNS (Domain Name System) translates human-friendly domain names into IP addresses, allowing users to access websites by name.
9. What is a DHCP server?
- DHCP (Dynamic Host Configuration Protocol) is a network protocol used to automatically assign IP addresses and configuration information to devices on a network.
10. Explain NAT (Network Address Translation).
- NAT is a method used to modify network address information in packet headers while in transit, typically used to allow multiple devices to share a single public IP address.
Q1. What is a Proxy Server?
A proxy server acts as a middleman between the user and the internet. It hides your IP and filters requests for security and anonymity.
Q2. What is DHCP Snooping?
DHCP Snooping is a security feature on switches that blocks rogue DHCP servers.
It ensures only trusted devices can assign IP addresses, preventing attacks like DHCP spoofing.
Q3. What is a DMZ in networking?
DMZ (Demilitarized Zone) is a separate network that adds a security layer by isolating public-facing servers from the internal network.
Q4. What is SNMP used for?
Simple Network Management Protocol monitors, manages, and collects data from network devices like routers and switches.
Q5. What is Port Forwarding?
Port forwarding allows external devices to access internal network services using specific ports — useful for hosting servers or remote access. THats content make image and give me all the things like caption
Source: https://www.coursera.org/articles/network-engineer-interview-questions
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interview
1. What is an IP address?
- An IP address is a unique numerical label assigned to each device in a network to identify and locate it.
2. Explain the difference between IPv4 and IPv6.
- IPv4 uses a 32-bit address format, while IPv6 uses a 128-bit address format. IPv6 was introduced to overcome the shortage of available IPv4 addresses.
3. What is a subnet mask?
- A subnet mask is used to divide an IP network into subnetworks by specifying which portion of the address is the network and which is the host.
4. Define MAC address.
- A MAC address (Media Access Control address) is a hardware address that uniquely identifies a device on a local network.
5. What is a router?
- A router is a networking device that forwards data packets between different computer networks.
6. Explain the OSI model and its layers.
- The OSI model is a conceptual framework that standardizes the functions of a telecommunications or networking system. It has seven layers, from Physical to Application.
Here's a breakdown of the seven layers:
A. Physical Layer: Deals with the physical connection and transmission of raw data bits over a medium (e.g., cables, wireless signals).
B. Data Link Layer: Handles error-free transfer of data frames between two directly connected nodes.
C. Network Layer: Responsible for routing data packets across networks using IP addresses.
D. Transport Layer: Provides reliable or unreliable delivery of data segments between applications on different hosts.
E. Session Layer: Manages connections between applications, including establishing, maintaining, and terminating sessions.
F. Presentation Layer: Deals with data formatting, encryption, and compression to ensure data is in a usable format for the application layer.
G. Application Layer: Provides network services to applications, such as email, file transfer, and web browsing
7. What is a firewall?
- A firewall is a network security device that filters incoming and outgoingu network traffic based on an organization's previously established security policies.
8. What is DNS, and how does it work?
- DNS (Domain Name System) translates human-friendly domain names into IP addresses, allowing users to access websites by name.
9. What is a DHCP server?
- DHCP (Dynamic Host Configuration Protocol) is a network protocol used to automatically assign IP addresses and configuration information to devices on a network.
10. Explain NAT (Network Address Translation).
- NAT is a method used to modify network address information in packet headers while in transit, typically used to allow multiple devices to share a single public IP address.
Q1. What is a Proxy Server?
A proxy server acts as a middleman between the user and the internet. It hides your IP and filters requests for security and anonymity.
Q2. What is DHCP Snooping?
DHCP Snooping is a security feature on switches that blocks rogue DHCP servers.
It ensures only trusted devices can assign IP addresses, preventing attacks like DHCP spoofing.
Q3. What is a DMZ in networking?
DMZ (Demilitarized Zone) is a separate network that adds a security layer by isolating public-facing servers from the internal network.
Q4. What is SNMP used for?
Simple Network Management Protocol monitors, manages, and collects data from network devices like routers and switches.
Q5. What is Port Forwarding?
Port forwarding allows external devices to access internal network services using specific ports — useful for hosting servers or remote access. THats content make image and give me all the things like caption
Source: https://www.coursera.org/articles/network-engineer-interview-questions
#tag
interview
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