30 Top Networking Interview Questions
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| Fig 1: 30 Top Networking Interview Questions |
A firewall is a device that blocks unwanted or unauthorized traffic while allowing desired traffic to pass through it. A firewall blocks incoming and outgoing network traffic while a router allows traffic to pass from one network to another.
A router is a device that forwards IP packets. A router has an IP address that identifies the router. This IP address is used by hosts and other devices on the network to send IP packets to the router. The router then looks at the destination IP address and determines how to forward the packet to its destination.
2)What is a CACHE?
A cache is a memory that temporarily stores recently accessed data. This helps to reduce the number of times the data has to be retrieved from the hard drive or other memory device. A cache is like a shortcut in the hard drive that is used to reduce the time it takes to retrieve data.
3)What is a network?
A network is a collection of computers and other devices connected together that share information and resources. A network is a network of networks. A computer connected to a network is called a host. A computer on the same network as another host is called a peer.
4)What is a port?
A port is a logical communication channel through which two hosts can communicate. A port can be on a host, a router, or a switch. The most common type of port is a network port. A network port is used to connect to a network. Network ports can be used for sending and receiving data, or for connecting to other devices such as routers.
5)What is private IP Address?
A private IP address is an IP address that is only used on a single network. Private IP addresses are often used by home and small business users to connect their computers to the Internet.
6)What is a Virtual Private Network (VPN)?
A VPN is a private network that is used to provide a secure connection between two or more private networks. VPNs can be used to provide a secure connection between two or more private networks.
7)What are the advantages of a firewall?
- A firewall is a device that blocks unwanted or unauthorized traffic while allowing desired traffic to pass through it.
- A firewall is used to prevent hackers and unauthorized users from accessing network.
8)What is a DNS?
A DNS is a directory service that maps IP addresses to domain names. A DNS is a database that is used to map IP addresses to domain names. DNS is used to provide the internet with a way to find a domain name for an IP address.
9)What is Windows Firewall?
A Windows firewall is a built-in firewall that is included in Windows operating systems. Windows firewalls are enabled by default and can be configured to prevent network access for most applications.
10)What is a proxy?
A proxy can be used to provide an additional layer of security. A proxy can be used to encrypt data or to prevent users from viewing or modifying the data.
11)What is port blocker?
A port blocker is often used to prevent someone from connecting to a port that is being used for an illegal purpose. A port blocker can be used to protect a computer or network from viruses or hackers.
12)What is an ISP?
An Internet Service Provider (ISP) is a company that provides access to the Internet. An ISP can be an organization that owns the Internet infrastructure or a company that provides access to the Internet.
13)What is a digital wall?
Digital walls are often used by large companies that need to control access to their computer networks.
14)What are the different types of routers?
Routers can be of three types. A managed router, a network router, and a router in a box.
- A managed router is a router that is managed by an organization. A managed router is often used by companies that need to control access to their computer networks. Managed routers are often referred to as firewalls.
- A network router is a router that forwards data between two or more networks. Network routers can be used by a company to connect their network to another network.
- A router in a box is a router that is sold as a standalone device. A router in a box is often used by small businesses.
15)What Is a VLAN?
A VLAN is a type of private network that is used to provide a secure network for a specific group of computers. A VLAN can be used to provide a secure network for a group of computers that share a common set of resources. Basically, VLANs are the division of the single broadcast domain into the multiple broadcast domain to provide a secure network group.
16)WHAT IS A DHCP?
A DHCP is a protocol that provides IP addresses dynamically to hosts on a network.
17)What Is an IP Address?
An IP address is an address that is used to identify computers on a network. Basically, IP is the identification of the specific device on the network. And that address is the 32-bit address.
18)What are the Benefits Static Routing?
- It is the secure routing.
- It is fast routing.
- And the Administrative value is 1.
- Effective for the small organizations.
19)Why we use default routing?
Generally used for the unknown destinations and mostly used in the internet and this routing is mostly used to reduce the size of the routing table but that routing is last preferred routing.
20)What is hello and hold down timer of the OSPF?
- Hello Timer is 10 seconds.
- Hold Down Timer is 40 seconds.
21)What is the Multicast Address of the RIPng?
The Multicast Address of the RIPng is the FF02::9.
22)What are the flaws in the Routing information protocol?
- Don’t support the classless addressing.
- Updates are Broadcast.
- Maximum Routers in the RIP are 16.
- Exchange entire routing table after every 30 seconds.
23)Why areas introduced in the Open Shortest Path First Algorithm?
Areas introduced just for the traffic management.
24)What is the range of the private Autonomous System?
The private range of the AS is 64512-65535.
25)What is the BGP TCP port number?
BGP TCP port number is 179.
26)What are the metrics of the ISIS protocol?
- Delay
- Expense
- Error
27)What are the ISIS PDUs?
- Hello PDU.
- Link State PDU.
- Complete Sequence Number PDU.
- Partial Sequence Number PDU.
28)What are the States of OSPF?
There are the following 7 states of the OSPF:
- Down State
- Init State
- Two-way State
- Exstart State
- Exchange State
- Loading State
- Full State
29)Which OSPF LSA type is for externals LSA?
OSPF LSA type-5 is the type that is for the externals LSA.
30)How many hops count support the OSPF and EIGRP?
- OSPF support the unlimited hops count.
- EIGRP support the 255 hops count.
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