ClassicLink Overview and Usage

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson
Download our mobile app to listen on the go
Get App

Questions and Answers

What is ClassicLink?

  • A type of Security Group
  • A service allowing EC2 instances in EC2-Classic to communicate with instances in a VPC using private IPs (correct)
  • A type of VPC specific to region
  • A service to connect EC2 instances in EC2-Classic with VPC using public IPs

What does ClassicLink cost?

No additional charge, but existing cross Availability Zone data transfer charges apply.

How do I use ClassicLink?

Enable at least one VPC for ClassicLink and associate a Security Group from that VPC with the EC2-Classic instance.

Does the EC2-Classic instance become a member of the VPC?

<p>False (B)</p> Signup and view all the answers

Can I use EC2 public DNS hostnames from my EC2-Classic and EC2-VPC instances to address each other?

<p>False (B)</p> Signup and view all the answers

Are there any VPCs for which I cannot enable ClassicLink?

<p>True (A)</p> Signup and view all the answers

Can traffic from an EC2-Classic instance travel through the Amazon VPC and use the Internet gateway?

<p>False (B)</p> Signup and view all the answers

Does ClassicLink affect access control between EC2-Classic instances?

<p>False (B)</p> Signup and view all the answers

Will ClassicLink settings on my EC2-Classic instance persist through stop/start cycles?

<p>False (B)</p> Signup and view all the answers

Will my EC2-Classic instance be assigned a new private IP address after enabling ClassicLink?

<p>False (B)</p> Signup and view all the answers

Does ClassicLink allow EC2-Classic Security Group rules to reference VPC Security Groups?

<p>False (B)</p> Signup and view all the answers

Flashcards are hidden until you start studying

Study Notes

  • ClassicLink connects EC2 instances on the EC2-Classic platform with instances in a VPC using private IP addresses.
  • Requires enabling ClassicLink for a VPC and associating a Security Group from the VPC with an EC2-Classic instance.

Pricing Information

  • No extra charge for ClassicLink use, but data transfer charges between Availability Zones apply.

Usage Steps

  • Enable at least one VPC for ClassicLink in your account.
  • Associate a Security Group from the VPC to the desired EC2-Classic instance.
  • An EC2-Classic instance can only be linked to one VPC at a time.

Membership and Security Groups

  • An EC2-Classic instance does not become a part of the VPC; it joins the VPC Security Group associated with it.
  • All VPC Security Group rules govern communication with the EC2-Classic instance.

DNS and IP Communication

  • EC2 public DNS hostnames do not resolve to private IP addresses across EC2-Classic and EC2-VPC instances.

VPC Eligibility

  • ClassicLink cannot be enabled for VPCs with a CIDR in the 10.0.0.0/8 range, except for 10.0.0.0/16 and 10.1.0.0/16.
  • VPCs with route table entries directing to the 10.0.0.0/8 CIDR to non-local targets cannot enable ClassicLink.

Traffic Routing

  • Traffic from EC2-Classic instances can only route to private IPs within the VPC.
  • Cannot route traffic to external destinations such as internet gateways or peered VPCs.

Access Control

  • ClassicLink does not alter the existing Security Group access control for EC2-Classic instances.

Instance Cycles

  • ClassicLink connections do not persist through stop/start cycles; they need to be re-established.
  • Connection does persist through instance reboots.

IP Addressing

  • Enabling ClassicLink does not assign a new private IP address; the existing private IP remains for communication with VPC resources.

Security Group References

  • EC2-Classic Security Group rules cannot reference VPC Security Groups and vice versa.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team
Use Quizgecko on...
Browser
Open
Browser
Browser