ServiceNow Senior Support Engineer Interview Questions, Process, and Tips

A stack is a data structure that follows the Last In, First Out (LIFO) principle, where elements are added and removed from the top.

• Elements are added to the top of the stack and removed from the top as well

• Common operations on a stack include push (add element) and pop (remove element)

• Examples of stacks include the call stack in programming and a stack of plates

VPC stands for Virtual Private Cloud, it is needed to securely isolate resources within the cloud environment.

• VPC allows you to create a private network in the cloud.

• It provides control over network settings such as IP address range, subnets, route tables, and network gateways.

• VPC helps in securing resources by setting up security groups and network access control lists.

• It enables you to connect your on-premises networ...read more

A load balancer is a device or software that distributes network or application traffic across multiple servers to ensure no single server is overwhelmed.

• Balances traffic across multiple servers

• Improves performance and reliability

• Can be hardware or software based

• Examples: F5 BIG-IP, NGINX, HAProxy

IAM stands for Identity and Access Management. Policies are rules that determine who has access to what resources.

• IAM is a framework for managing digital identities and controlling access to resources

• IAM policies are rules that define the permissions and access levels for different users or groups

• IAM policies can be attached to users, groups, or resources to control access

• IAM helps organizations ensure that only author...read more

DNS server is a system that translates domain names to IP addresses, allowing users to access websites using human-readable names.

• DNS servers store a database of domain names and their corresponding IP addresses.

• When a user enters a domain name in a web browser, the DNS server is queried to find the corresponding IP address.

• DNS servers help in the efficient routing of internet traffic by translating domain names to IP ...read more

Types of lookup tables include direct mapping, associative arrays, and hash tables.

• Direct mapping: uses a key to directly access the corresponding value in the table

• Associative arrays: store key-value pairs where keys are unique

• Hash tables: use a hash function to map keys to values for efficient retrieval

Troubleshooting steps for network issues

• Check physical connections (cables, ports)

• Verify network settings (IP address, subnet mask)

• Restart networking devices (modem, router)

• Run network diagnostics tools (ping, traceroute)

• Check for software conflicts or firewall issues