II - Mission Support Classified
Rules and Groups employed by this XCCDF Profile
-
SRG-NET-000362-L2S-000025
Group -
The Juniper EX switch must be configured to enable DHCP snooping for all user VLANs to validate DHCP messages from untrusted sources.
In an enterprise network, devices under administrative control are trusted sources. These devices include the switches, routers, and servers in the network. Host interfaces and unknown DHCP servers...Rule Medium Severity -
SRG-NET-000362-L2S-000026
Group -
The Juniper EX switch must be configured to enable IP Source Guard on all user-facing or untrusted access VLANs.
IP Source Guard provides source IP address filtering on an untrusted layer 2 interface to prevent a malicious host from impersonating a legitimate host by assuming the legitimate host's IP address....Rule Medium Severity -
SRG-NET-000362-L2S-000027
Group -
The Juniper EX switch must be configured to enable Dynamic Address Resolution Protocol (ARP) Inspection (DAI) on all user VLANs.
DAI intercepts Address Resolution Protocol (ARP) requests and verifies that each of these packets has a valid IP-to-MAC address binding before updating the local ARP cache and before forwarding the...Rule Medium Severity -
SRG-NET-000512-L2S-000001
Group -
The Juniper EX switch must be configured to enable Storm Control on all host-facing access interfaces.
A traffic storm occurs when packets flood a LAN, creating excessive traffic and degrading network performance. Traffic storm control prevents network disruption by suppressing ingress traffic when ...Rule Low Severity -
SRG-NET-000512-L2S-000002
Group -
The Juniper EX switch must be configured to enable IGMP or MLD Snooping on all VLANs.
IGMP and MLD snooping provides a way to constrain multicast traffic at layer 2. By monitoring the IGMP or MLD membership reports sent by hosts within a VLAN, the snooping application can set up lay...Rule Low Severity -
SRG-NET-000512-L2S-000003
Group -
If STP is used, the Juniper EX switch must be configured to implement Rapid STP, or Multiple STP, where VLANs span multiple switches with redundant links.
Spanning Tree Protocol (STP) is implemented on bridges and switches to prevent layer 2 loops when a broadcast domain spans multiple bridges and switches and when redundant links are provisioned to ...Rule Medium Severity -
SRG-NET-000512-L2S-000004
Group -
The Juniper EX switch must be configured to verify two-way connectivity on all interswitch trunked interfaces.
In topologies where fiber optic interconnections are used, physical misconnections can occur that allow a link to appear to be up when there is a mismatched set of transmit/receive pairs. When such...Rule Medium Severity -
SRG-NET-000512-L2S-000007
Group -
The Juniper EX switch must be configured to assign all disabled access interfaces to an unused VLAN.
It is possible that a disabled access interface that is assigned to a user or management VLAN becomes enabled by accident or by an attacker and as a result gains access to that VLAN as a member.Rule Medium Severity -
SRG-NET-000512-L2S-000008
Group -
The Juniper EX switch must not be configured with VLANs used for L2 control traffic assigned to any host-facing access interface.
In a switched Ethernet network, some protocols use L2 Protocol Data Units (PDU) to communicate in-band management or other control information. This control traffic is inappropriate for host-facing...Rule Medium Severity -
SRG-NET-000512-L2S-000009
Group -
The Juniper EX switch must be configured to prune the default VLAN from all trunked interfaces that do not require it.
All unassigned interfaces are placed into the default VLAN and devices connected to enabled, but unassigned interfaces can communicate within that VLAN. Although the default VLAN is not automatical...Rule Medium Severity
Node 2
The content of the drawer really is up to you. It could have form fields, definition lists, text lists, labels, charts, progress bars, etc. Spacing recommendation is 24px margins. You can put tabs in here, and can also make the drawer scrollable.