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Zorluk: KolayFirewalls and Access Control Lists (ACLs)

A security technician needs to configure an extended Access Control List (ACL) rule on a router to permit secure HTTPS web traffic from an internal subnet to an external web server. Which transport protocol and destination port combination must be specified in the ACL rule to correctly match this traffic?

  1. TCP protocol with destination port 443Cevap
  2. B
    UDP protocol with destination port 443
  3. C
    TCP protocol with destination port 80
  4. D
    IP protocol with Layer 2 MAC destination port 443

Cevap

TCP protocol with destination port 443
HTTPS (Hypertext Transfer Protocol Secure) encrypts web communications using TLS/SSL and operates over the reliable Transmission Control Protocol (TCP) on standard destination port 443. An extended Access Control List filtering this traffic must specify TCP as the protocol and 443 as the destination port.

Adım Adım Çözüm

1
Identify the application layer protocol requested in the scenario.
The scenario specifies secure HTTPS web traffic.
Understanding the required application service determines the transport protocol and port number.
2
Determine the transport layer protocol used by HTTPS.
HTTPS requires TCP to establish reliable, stateful connections via TLS/SSL.
Web traffic requires reliable deliverability and packet ordering provided by TCP rather than connectionless UDP.
3
Determine the standard destination port assigned to HTTPS.
The standard well-known port for HTTPS is port 443.
Standard port numbers allow firewalls and extended ACLs to inspect and filter network traffic accurately based on service type.

Anahtar Kavram

ACL Port and Protocol Matching for Secure Web Services
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Konular

Firewalls and Access Control Lists (ACLs)

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