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The Juniper EX switch must be configured to set all enabled user-facing or untrusted ports as access interfaces.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-253970JUEX-L2-000230SV-253970r1082976_ruleCCI-000366medium
Description
By default, unconfigured (or expressly disabled) Junos interfaces are unusable. Any enabled interface configured with the family ethernet-switching uses interface-mode access by default, which meets this requirement. Trunked interfaces must be explicitly configured for operational requirements (e.g., interswitch links), which makes them trusted and not user-facing. Configuring enabled user-facing or untrusted interfaces as trunked may expose network traffic to an unauthorized, or unintended, connected endpoint. Access interfaces can belong to a single VLAN rather than the multiple VLANs supported by trunks, which limits potential exposure to a smaller subset of the total network traffic. Access interfaces also behave differently than trunked interfaces, especially with respect to control plane traffic. For example, access interfaces can be marked as "edge" for protocols like Rapid Spanning Tree (RSTP) or Multiple Spanning Tree (MSTP) where specific protections can be applied to prevent the switch from accepting Bridge Protocol Data Units (BPDU) from unauthorized sources and causing a network topology change or disruption. Additionally, network level protection mechanisms, like 802.1x or sticky-mac, are applied to access interfaces and these protection mechanisms help prevent unauthorized network access.
STIGDate
Juniper EX Series Switches Layer 2 Switch Security Technical Implementation Guide2026-06-03

Related Frameworks

1 mapping across 5 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (8) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

CFG-01Configuration Management Program
1.00
END-01Endpoint Device Management (EDM)
1.00
END-04Malicious Code Protection (Anti-Malware)
1.00
END-06Endpoint File Integrity Monitoring (FIM)
1.00
MON-01Continuous Monitoring
1.00
MON-01.7File Integrity Monitoring (FIM)
1.00
CFG-02Secure Baseline Configurations
0.50
CFG-02.7Approved Configuration Deviations
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (100) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-12Session Termination
1.00
AC-16(1)Dynamic Attribute Association
1.00
AC-17(1)Monitoring and Control
1.00
AC-2Account Management
1.00
AC-2(1)Automated System Account Management
1.00
AC-2(11)Usage Conditions
1.00
AC-2(3)Disable Accounts
1.00
AC-2(4)Automated Audit Actions
1.00
AC-24(1)Transmit Access Authorization Information
1.00
AC-25Reference Monitor
1.00

+90 more (top 10 by confidence shown)

NIST 800-1710 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (2) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

3.4.1
1.00
3.4.2
1.00
CCI1 mapping
CCI-000366
1.00
NIST CSF 2.00 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (5) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

DE.CM-09
1.00
PR.PS-01
1.00
PR.DS-10
0.50
PR.PSPlatform Security
0.50
PR.PS-05
0.50

Who does this work

10 NICE work roles and 9 EC-Council certifications.

This is an inference across published mappings, not a single claim by anyone. This check maps to a control, which maps to a Cybersecurity Framework outcome, which NIST assigns to the work roles below. EC-Council separately maps its certifications to those same roles.

A certification prepares someone for a role. It is not evidence that a holder is qualified, and neither NIST nor EC-Council has stated that any certification here addresses this check.

Work-role assignments published by NIST (NICE Framework Components 2.2.0 and the CSF 2.0 OLIR crosswalk). Certification mappings published by EC-Council.

Details

Check Text (C-253970r1082976_chk)

Review the switch configuration and examine all enabled user-facing or untrusted interfaces configured with family ethernet-switching. 1. Interfaces implicitly configured with "interface-mode" access and family ethernet-switching. Note: The default interface-mode is "access". user@host> show configuration interfaces <interface name> { unit 0 { family ethernet-switching { } } } 2. Interfaces explicitly configured with "interface-mode" access and family ethernet-switching. user@host> show configuration interfaces <interface name> { unit 0 { family ethernet-switching { interface-mode access; } } } If any of the enabled user-facing access interfaces are configured as a trunk, this is a finding.

Fix Text (F-57373r1082975_fix)

Disable trunking on all enabled user-facing or untrusted access interfaces. Delete "interface-mode" from an enabled user-facing or untrusted interface to inherit the default access mode. user@host> configure user@host# delete interfaces <interface name> unit 0 family ethernet-switching interface-mode Alternatively, explicitly set the enabled user-facing or untrusted interface mode to access. user@host> configure user@host# set interfaces <interface name> unit 0 family ethernet-switching interface-mode access