{"id":3050,"date":"2019-08-31T11:36:21","date_gmt":"2019-08-31T11:36:21","guid":{"rendered":"https:\/\/www.testpreptraining.com\/tutorial\/?page_id=3050"},"modified":"2020-05-02T05:22:20","modified_gmt":"2020-05-02T05:22:20","slug":"security-groups","status":"publish","type":"page","link":"https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-solutions-architect-professional-sap-c01\/security-groups\/","title":{"rendered":"Security Groups"},"content":{"rendered":"\n<ul class=\"wp-block-list\"><li>It acts as a virtual firewall for instance to control inbound and outbound traffic.<\/li><li>After launching instance in VPC, can assign up to 5 security groups to instance.<\/li><li>Security groups act at instance level, not subnet level.<\/li><li>each instance in a subnet in VPC could be assigned to a different set of security groups.<\/li><li>If security group not specified at launch time, the instance is automatically assigned to the default security group for the VPC.<\/li><li>Can add rules to control inbound traffic to instances,<\/li><li>separate set of rules to control the outbound traffic.<\/li><li>have limits on\n<ul>\n<li>number of security groups, can be created per VPC,<\/li>\n<\/ul>\n<ul>\n<li>number of rules, can be added to each security group<\/li>\n<\/ul>\n<ul>\n<li>number of security groups, can be associated with a network interface.<\/li>\n<\/ul>\n<\/li><li>allow rules only can be specified<\/li><li>deny rules cannot be specified<\/li><li>inbound and outbound traffic can have their own separate rules.<\/li><li>no inbound rules during security group creation<\/li><li>By default, a security group has outbound rule to allows all outbound traffic.<\/li><li>Security groups are stateful<\/li><li>if request is sent from instance, the response traffic for that request is allowed to flow in regardless of inbound security group rules.<\/li><li>Irrespective of outbound rules, response to permitted inbound traffic, will be sent<\/li><li>Instances with a security group can&#8217;t talk to each other unless rules allow<\/li><li>All security group has a set of rules added to them, by default<\/li><li>security group name and description should comply as\n<ul>\n<li>Names and descriptions can be up to 255 characters in length.<\/li>\n<\/ul>\n<ul>\n<li>Names and descriptions are limited to the following characters: a-z, A-Z, 0-9, spaces, and ._-:\/()#,@[]+=&amp;;{}!$*.<\/li>\n<\/ul>\n<ul>\n<li>A security group name cannot start with sg-.<\/li>\n<\/ul>\n<ul>\n<li>The name of security group name should be unique in the VPC.<\/li>\n<\/ul>\n<\/li><\/ul>\n\n\n\n<p>Default rules for a default security group<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><td>Destination<\/td><td>Protocol<\/td><td>Port Range<\/td><td>Comments<\/td><\/tr><\/thead><tbody><tr><td>Inbound &#8211; The security group ID (sg-xxxxxxxx)<\/td><td>All<\/td><td>All<\/td><td>Allow inbound traffic from instances assigned to the same security group.<\/td><\/tr><tr><td>Outbound &#8211; 0.0.0.0\/0<\/td><td>All<\/td><td>All<\/td><td>Allow all outbound IPv4 traffic.<\/td><\/tr><tr><td>Outbound &#8211; &nbsp; ::\/0<\/td><td>All<\/td><td>All<\/td><td>Allow all outbound IPv6 traffic. This rule is added by default if you create a VPC with an IPv6 CIDR block or if you associate an IPv6 CIDR block with existing VPC.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Security Group Rules<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>User can easily add or eliminate rules for a specific security group<\/li><li>Security group rule can be applied either to ingress\/inbound traffic to the security group &nbsp;or egress\/ outbound traffic to the security group.<\/li><li>Flexibility to grant access to\n<ul>\n<li>specific CIDR range<\/li>\n<\/ul>\n<ul>\n<li>another security group in VPC<\/li>\n<\/ul>\n<ul>\n<li>in a peer VPC<\/li>\n<\/ul>\n<\/li><li>Following are applicable to security<\/li><li>Contents of security group rule in an AWS VPC\n<ul>\n<li>Name of any protocol as specified by IANA, and as per standard protocol number. Like for ICMP as protocol, can also enlist any or all of ICMP types and codes.<\/li>\n<\/ul>\n<ul>\n<li>An description for security group rule.\n<ul>\n<li>It is optional<\/li>\n<\/ul>\n<ul>\n<li>Description helps in identification, later.<\/li>\n<\/ul>\n<ul>\n<li>Maximum 255 characters in length.<\/li>\n<\/ul>\n<ul>\n<li>Allowed characters are\n<ul>\n<li>a-z<\/li>\n<\/ul>\n<ul>\n<li>A-Z<\/li>\n<\/ul>\n<ul>\n<li>&nbsp;0-9<\/li>\n<\/ul>\n<ul>\n<li>Spaces<\/li>\n<\/ul>\n<ul>\n<li>&nbsp;._-:\/()#,@[]+=;{}!$*.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li><li>&nbsp;\n<ul>\n<li>For rules which act on Inbound\n<ul>\n<li>Specify source of traffic and destination port or port range<\/li>\n<\/ul>\n<ul>\n<li>source can be\n<ul>\n<li>another security group<\/li>\n<\/ul>\n<ul>\n<li>an IPv4 or IPv6 CIDR block<\/li>\n<\/ul>\n<ul>\n<li>single IPv4 or IPv6 address.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li>For rules which act on Inbound\n<ul>\n<li>Specify destination for traffic and destination port or port range<\/li>\n<\/ul>\n<ul>\n<li>destination can be\n<ul>\n<li>another security group<\/li>\n<\/ul>\n<ul>\n<li>an IPv4 or IPv6 CIDR block<\/li>\n<\/ul>\n<ul>\n<li>single IPv4 or IPv6 address<\/li>\n<\/ul>\n<ul>\n<li>prefix list ID (ID of service for a Region).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"373\" height=\"400\" src=\"https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2019\/09\/image-146-373x400.png\" alt=\"\" class=\"wp-image-3732\" srcset=\"https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2019\/09\/image-146-373x400.png 373w, https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2019\/09\/image-146.png 472w\" sizes=\"auto, (max-width: 373px) 100vw, 373px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>It acts as a virtual firewall for instance to control inbound and outbound traffic. After launching instance in VPC, can assign up to 5 security groups to instance. Security groups act at instance level, not subnet level. each instance in a subnet in VPC could be assigned to a different set of security groups. If&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":2471,"menu_order":40,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[7,529],"class_list":["post-3050","page","type-page","status-publish","hentry","tag-aws","tag-security-groups"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Security Groups - Tutorials (TestpPrep)<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-solutions-architect-professional-sap-c01\/security-groups\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Security Groups - Tutorials (TestpPrep)\" \/>\n<meta property=\"og:description\" content=\"It acts as a virtual firewall for instance to control inbound and outbound traffic. 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