Network Security in Cloud | Dataford Interview Questions

How do you implement network security in cloud environments?

Implement an ordered IPv4 firewall evaluator that applies the first matching rule to each packet and denies packets with no match. Each rule contains a CIDR network, protocol, optional port, and action; "*" and null represent wildcards. Define evaluate_firewall(rules, packets) where rules and packets are lists of dictionaries, and return one action string per packet.

Constraints

1 <= rules.length <= 10^4
1 <= packets.length <= 10^4
Each IPv4 address contains four decimal octets in the range 0 through 255
Each CIDR prefix is an integer from 0 through 32
Each rule protocol is a lowercase protocol name or '*', and each packet protocol is a lowercase protocol name
Each port is an integer from 0 through 65535, or null in a rule
Each action is either 'allow' or 'deny'
Rules use first-match semantics and unmatched packets must be denied

Function Signature

def evaluate_firewall(rules, packets):

Your question is Network Security in Cloud. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Problem

How do you implement network security in cloud environments?

Constraints

1 <= rules.length <= 10^4
1 <= packets.length <= 10^4
Each IPv4 address contains four decimal octets in the range 0 through 255
Each CIDR prefix is an integer from 0 through 32
Each rule protocol is a lowercase protocol name or '*', and each packet protocol is a lowercase protocol name
Each port is an integer from 0 through 65535, or null in a rule
Each action is either 'allow' or 'deny'
Rules use first-match semantics and unmatched packets must be denied

Function Signature

def evaluate_firewall(rules, packets):

Your question is Network Security in Cloud. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.