Infosys Network Engineer Interview Questions and Answers

Default single port range when neither port range in source NAT pools nor default port range are configured.

• When neither port range in source NAT pools nor default port range are configured, the default single port range is 1024 through 63,487.

• This range is used for outbound traffic initiated by the device.

• It is important to configure the port range to avoid conflicts with other devices on the network.

• For example, if multiple devices are using the same default port range, it ...read more

NAT is a technique used to map private IP addresses to public IP addresses. Port numbers are used to identify specific applications.

• NAT stands for Network Address Translation

• It is used to allow devices with private IP addresses to access the internet using a public IP address

• Port numbers are used to identify specific applications or services

• Common port numbers include 80 for HTTP, 443 for HTTPS, and 22 for SSH

BGP routing tables store information about routes to different networks and the best path to reach them.

• BGP uses a path-vector routing protocol to determine the best path for a packet to reach its destination.

• BGP routing tables contain information about the network prefixes, the next hop to reach them, and the path attributes that determine the best path.

• BGP routers exchange routing information with their neighbors to build and maintain their routing tables.

• BGP routing tables...read more

To check port and duplex setting, MSS and MTU, and link utilization in network engineering.

• Use command 'show interface' to check port and duplex setting.

• Use command 'ping -f -l ' to check MTU.

• Use command 'netstat -s' to check MSS.

• Use command 'show interface' or 'show interfaces utilization' to check link utilization.

MSS in TCP refers to the maximum segment size, which is the largest amount of data that can be sent in a single TCP segment.

• MSS is negotiated during the TCP three-way handshake

• It is determined by the maximum transmission unit (MTU) of the network

• MSS can be adjusted by the sender or receiver using TCP options

• A smaller MSS can help prevent fragmentation and improve network performance

Configuring BGP with loopback for network engineer position.

• Configure loopback interface on router

• Assign IP address to loopback interface

• Enable BGP on router

• Configure BGP neighbor relationship with remote router

• Use loopback interface IP address as BGP neighbor address

• Advertise network prefixes to BGP

• Verify BGP peering and routing table

The lifecycle of a thread includes five states: new, runnable, running, blocked, and terminated.

• A thread is created in the new state.

• In the runnable state, the thread is ready to run but not currently running.

• When the thread is executing instructions, it is in the running state.

• If a thread is waiting for a resource, it is in the blocked state.

• The thread enters the terminated state when it completes its execution.