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CCNP Wireless Security

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Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. 3 categories of segmented traffic
1. Interfac Configuration --> RADIUS (IETF) --> check 64 (Tunnel Type) - 65 (Tunnel Medium Type) - 81 (Tunnel Private-group-id) 2. Navigate to Group Setup and enable the checkboxes for the previous attributes - where 64=VLAN - 65=802 - 81=<Vlan_tag>
1. config mobility list to support anchor & foreign wlcs (using different mob. groups on ea. to keep auth. seperate between anchor & foreigns) 2. Map the guest wlan on foreign wlc to either mgmt int. or fake dynamic int. (ie dynamic int tied to a vla
1. client begins in Quarenteen vlan & NAA sends posture assesment to NAS 2. assesment is verified against policies in NAM 3. If in compliance - client is moved to access vlan. If not - NAS sends remediation info to client 4 NAA guides user through re
1. application type 2. security capabilities 3. QoS policy

2. Reason why you can NOT use WLC RADIUS server to auth. against OpenLDAP or Win-2003 (or later)
specifies fast bss transitions by allowing negotiations and requests for wireless resources to occur simultaneously. Does this by allowing for part of the key to be cached (server key) among the network - so full 802.1x auth. isnt required
Nac Guest Server - used for provisioning guest accts - detailed usage reporting - delivery of creds via emai/sms -
1. Log into cert. server - from ACS -and click link to install it locally 2. Log into ACS and install cert into local store 3. DL cert chain from CA to ACS store 4. Tell ACS to use that cert from its store 5. restart ACS 6. log back into ACS and inst
WLC RADIUS server only works if passwords are sent in Clear-text from LDAP.

3. Regulatory Compliance Acronyms
a mobility list can contain multiple mobility groups
WLC can detect 802.11 attacks - but not other attacks from valid wireless clients.
used with PEAP for user/password authentication
US: 1. HIPAA 2. GLBA 3. FFIEC 4. SOX 5. FIPS 6. NIAP Canada: 1. PIPEDA Japan: 1. JPIPA

4. How to add IPS TLS info to WLC
WLC generates a Message Integrity Check Information Element (MIC IE) - which includes a sequence # - and aps add it to each mgmt frame. Clients ignore this IE - as they do not understand it.
1. NAC Guest Server (NGS) - Like a RADIUS server when people can create guest accounts 2. Nac Manager (NAM) - Centrilized server for creating policies & profiles that determine network access. 3. Network Access Server (NAS) - The device which control
1. HMAC-MD5 2. HMAC-SHA
Security --> Advanced --> CIDS --> Sensors

5. How does client MFP work
WLC RADIUS server only works if passwords are sent in Clear-text from LDAP.
1. config mobility list to support anchor & foreign wlcs (using different mob. groups on ea. to keep auth. seperate between anchor & foreigns) 2. Map the guest wlan on foreign wlc to either mgmt int. or fake dynamic int. (ie dynamic int tied to a vla
Clients download a key for their wlan - after auth - so they can understand that IE in the mgmt frame
clients are load ballanced between them - this can not be configured otherwise.

6. Switchport config to enable dot1x on a port
switchport mode access - dot1x pae authenticator - dot1x port-control auto
1. Min. RSSI 2. Roam Hysterisis - how much higher than current RSSI compared to neighbor ap RSSI before roaming request initiates 3. Scan Threshold - How low the current RSSI must be for the client to start scanning for a better ap 4. Transition Time
assigning multiple vlans to single wlan - and users are dynamically mapped to one of the vlans in round-robin
1. RSSI 2. SNR 3. Load-Ballancing

7. How does CCKM simplify PMK Caching
1. PMK is only valid for 1 hour -- CCKM creates a main key & derives secondary keys. These secondary keys are sent to all wlc/aps.
Clients download a key for their wlan - after auth - so they can understand that IE in the mgmt frame
802.11i - 802.11r - 802.11w & 802.11n
HTTPS

8. Steps to config. .1x for AP to WLC connections
1. Captive Portal 2. NAA (agent installed on windows); auth twice (1 to radius 2 to nac) 3. NAA w/ SSO - user authss once. & wlc auths to nac on their behalf.
x509 cert to establish DTLS capwap control tunnel. It can be either 1. LSC 2. MIC (Mafctr installed cert) or 3. SSC
1. Wireless-->AP Global Config-->enable dot1x w/ user/pass 2. Config the switch port to enable auth. to ACS/RADIUS
1. client begins in Quarenteen vlan & NAA sends posture assesment to NAS 2. assesment is verified against policies in NAM 3. If in compliance - client is moved to access vlan. If not - NAS sends remediation info to client 4 NAA guides user through re

9. What CCX version is required for CCKM
1. Guest User 2. Sponsor 3. Network Enforcement Device (ie wlc) 4. NGS Server itself
1. User performs .1x with RADIUS 2. WLC forwards radius accounting start to NAM (along with clients IP) 3. clients NAA detects network con. & tries to connect to NAM. 4. NAS Intercepts step 3 & contacts NAM itself to see if client is in the online li
1. v2 - LEAP 2. v3 - EAP-FAST 3. v4 - PEAP & EAP-TLS
1. Create user acct. in IDS for each WLC in the viewer role 2. add the WLCs IP as an allowed host 3. Obtain the IPS TLS Fingerprint & add it to WLC 4. Enable the client exclusion policy on the WLAN 5. Set msg log level to Alerts to log IPS events

10. What is the radius server override interface option under WLAN-->AAA?
UDP 5246 & 5247
mping = tests intercontroller control traffic. eping = tests intercontroller data traffic (EoIP)
1. Integrated -- wIPS monitor mode aps are part of client-serving infrastructure 2. Overlay -- wIPS aps - WCS & WLCs are totally seperate
Sends RADIUS packets from a dynamic interface instead of the WLC Mgmt interface address

11. What is included in a Pairwise Transient Key (PTK)
1. Temporal Key for Unicast 2. Key Confirmation Key (KCK) - used for group handshakes 3. Key Encryption Key (KEK) - for encrypting the group encyrption key used to derive the braodcast/multicast keys.
1 AP per 15 -000 sq. feet.
1. client -> authenticator: eapol_start 2. authenticator -> client: eap request/identity 3. client -> authenticator: eap response/identity 4. authenticator -> aaa: radius access request 5. aaa -> client: eap-tls handshake 6.aaa -> authenticator: radi
x509 cert to establish DTLS capwap control tunnel. It can be either 1. LSC 2. MIC (Mafctr installed cert) or 3. SSC

12. What triggers can initiate a WLC to request a client to roam
1. Min. RSSI 2. Roam Hysterisis - how much higher than current RSSI compared to neighbor ap RSSI before roaming request initiates 3. Scan Threshold - How low the current RSSI must be for the client to start scanning for a better ap 4. Transition Time
1. WLC must be defined as a VPN Conentrator - in the NAC config. 2. WLC must be configd to send RADIUS acct. to NAC
1. User performs .1x with RADIUS 2. WLC forwards radius accounting start to NAM (along with clients IP) 3. clients NAA detects network con. & tries to connect to NAM. 4. NAS Intercepts step 3 & contacts NAM itself to see if client is in the online li
based on auth. group -1. vlan 2. qos 3. acl 4. tunnel attributes

13. Encryption types used by SNMPv3
1. NAC Guest Server (NGS) - Like a RADIUS server when people can create guest accounts 2. Nac Manager (NAM) - Centrilized server for creating policies & profiles that determine network access. 3. Network Access Server (NAS) - The device which control
1. v2 - LEAP 2. v3 - EAP-FAST 3. v4 - PEAP & EAP-TLS
1. CBC-DES 2. CFB-AES-128
Clients send info re: previously associated aps to current ap - so it can use this information to inform current clients about neighboring aps. Requires CCXv2

14. What is used for HREAP Roaming re: keying
WLCs create a deriviative of the PMK - called Opportunistic Key Caching (OPC) for fast-roaming among HREAPs in the same HREAP group.
1. v2 - LEAP 2. v3 - EAP-FAST 3. v4 - PEAP & EAP-TLS
It handles .1x & NAC auth. with Single Sign on. WLC forwards RADIUS accounting messages (of EAPOL Success) to the NAC upon login - authing the client to nac - & then it goes through posturing
AES-Key Wrap

15. Eap process/messages
x509v3 certificate
UDP 5246 & 5247
300ms
1. client -> authenticator: eapol_start 2. authenticator -> client: eap request/identity 3. client -> authenticator: eap response/identity 4. authenticator -> aaa: radius access request 5. aaa -> client: eap-tls handshake 6.aaa -> authenticator: radi

16. 802.11R
specifies fast bss transitions by allowing negotiations and requests for wireless resources to occur simultaneously. Does this by allowing for part of the key to be cached (server key) among the network - so full 802.1x auth. isnt required
a mobility list can contain multiple mobility groups
802.11i - 802.11r - 802.11w & 802.11n
Sends the PMK to all WLCs that the client can roam to.

17. When PKC is used
what occurs as a client roams to new ap -WLC forwards cached PMK to AP. Client then forms a Pairwise Transient Key (PTK) via 4-way handshake w/ ap.
after .1x authentication user is forwarded to a splash page. This is done via RADIUS attribute
Check Shell(exec) then define roles as role1=MANAGEMENT role2=WLAN role3...etc
enables Identity Based Netowrking (IBN) where wlan settings are changed per-user (qos - vlan - acls - or timeouts)

18. Why add an IPS if WLCs already detect attacks.
1. Temporal Key for Unicast 2. Key Confirmation Key (KCK) - used for group handshakes 3. Key Encryption Key (KEK) - for encrypting the group encyrption key used to derive the braodcast/multicast keys.
Sends the PMK to all WLCs that the client can roam to.
1812 - Authentication 1813 - Authorization
WLC can detect 802.11 attacks - but not other attacks from valid wireless clients.

19. Things to Enable in ACS (Global Authentication Page) for PEAP support
x509v3 certificate
dot1x system-auth-control - aaa new-model - aaa authentication dot1x default group radius - radius serve host 10.1.1.2 auth-port 1812 acct port 1813 key <key>
WLC generates a Message Integrity Check Information Element (MIC IE) - which includes a sequence # - and aps add it to each mgmt frame. Clients ignore this IE - as they do not understand it.
1. Allow EAP-MSCHAPv2 2. Allow EAP-GTC 3. Check Posture Validation when doing NAC

20. When submitting a CSR from ACS
MFP-1 protects infrastructure from management frame attacks (ie aps only). MFP-2 Protects both infrastructure & clients
what must you ensure -1.Exportable 2.Server Auth Cert 3.Store cert in local cert store
WLCs create a deriviative of the PMK - called Opportunistic Key Caching (OPC) for fast-roaming among HREAPs in the same HREAP group.
1. Temporal Key for Unicast 2. Key Confirmation Key (KCK) - used for group handshakes 3. Key Encryption Key (KEK) - for encrypting the group encyrption key used to derive the braodcast/multicast keys.

21. Authentication types used by SNMPv3
US: 1. HIPAA 2. GLBA 3. FFIEC 4. SOX 5. FIPS 6. NIAP Canada: 1. PIPEDA Japan: 1. JPIPA
1. disassociation 2. deauthentication 3.QoS (WMM)
1. HMAC-MD5 2. HMAC-SHA
mititgate non-802.11 attacks

22. How long before an HREAP goes into disconnected/standalone mode
1. client begins in Quarenteen vlan & NAA sends posture assesment to NAS 2. assesment is verified against policies in NAM 3. If in compliance - client is moved to access vlan. If not - NAS sends remediation info to client 4 NAA guides user through re
300ms
WLCs create a deriviative of the PMK - called Opportunistic Key Caching (OPC) for fast-roaming among HREAPs in the same HREAP group.
EAP-FAST with anonymous pac provisioning

23. 6 criteria types for rogue classification
1. RSSI 2. Duration 3. Client Count 4. No encryption 5. Managed SSID (ie UNLV) 6. SSID
1. Scanning - for other aps in the area 2. exchanging 802.11 auth messages (first from client then from ap) w/ the target ap 3. exchanging re-association messages with target ap 4. dot1x master key (PMK) negotiation 5. key derivation - 4way handshake
used with PEAP for user/password authentication
same as steps to roaming in non-802.1R except: skips PMK negotiation & piggybacks PTK & QoS with the 802.11 authentication & association messages

24. How fast is fast secure roaming
-150ms
1. In-band virtual gateway -- is at L2 and intercepts all traffic and re-tags the default/untrusted vlan to the trusted vlan - based on compliance 2. In-Band Real IP Gateway - is the gateway 3. Out-of-band virtual gateway (same is 1 - except traffic
HTTPS
1. udp 16666 for control traffic 2. IP Protocol 97 (EoIP) for client data traffic

25. How is the CAPWAP tunnel between AP & WLC encrypted
Check Shell(exec) then define roles as role1=MANAGEMENT role2=WLAN role3...etc
WLCs create a deriviative of the PMK - called Opportunistic Key Caching (OPC) for fast-roaming among HREAPs in the same HREAP group.
WLC RADIUS server only works if passwords are sent in Clear-text from LDAP.
x509v3 certificate

26. Whats added in CCXv5?
peap-mschapv2 - eap-tls - mfp-v1 - nac
mfp-v2
1. client -> authenticator: eapol_start 2. authenticator -> client: eap request/identity 3. client -> authenticator: eap response/identity 4. authenticator -> aaa: radius access request 5. aaa -> client: eap-tls handshake 6.aaa -> authenticator: radi
1. Integrated -- wIPS monitor mode aps are part of client-serving infrastructure 2. Overlay -- wIPS aps - WCS & WLCs are totally seperate

27. Steps to roaming in 802.1R
peap-mschapv2 - eap-tls - mfp-v1 - nac
after .1x authentication user is forwarded to a splash page. This is done via RADIUS attribute
same as steps to roaming in non-802.1R except: skips PMK negotiation & piggybacks PTK & QoS with the 802.11 authentication & association messages
1. Integrated -- wIPS monitor mode aps are part of client-serving infrastructure 2. Overlay -- wIPS aps - WCS & WLCs are totally seperate

28. Difference between mobility list and mobility group
1. udp 16666 for control traffic 2. IP Protocol 97 (EoIP) for client data traffic
1. v2 - LEAP 2. v3 - EAP-FAST 3. v4 - PEAP & EAP-TLS
a mobility list can contain multiple mobility groups
no

29. Steps to installing Server Cert into ACS
Check Shell(exec) then define roles as role1=MANAGEMENT role2=WLAN role3...etc
1. Log into cert. server - from ACS -and click link to install it locally 2. Log into ACS and install cert into local store 3. DL cert chain from CA to ACS store 4. Tell ACS to use that cert from its store 5. restart ACS 6. log back into ACS and inst
802.11w
specifies fast bss transitions by allowing negotiations and requests for wireless resources to occur simultaneously. Does this by allowing for part of the key to be cached (server key) among the network - so full 802.1x auth. isnt required

30. Ports to open on fw to allow foreign to anchor controller tunnel to be built
enables Identity Based Netowrking (IBN) where wlan settings are changed per-user (qos - vlan - acls - or timeouts)
1. HMAC-MD5 2. HMAC-SHA
Asymetric (public & Private key-pair)
1. udp 16666 for control traffic 2. IP Protocol 97 (EoIP) for client data traffic

31. When will a WLC use a Local EAP profile?
1. Allow EAP-MSCHAPv2 2. Allow EAP-GTC 3. Check Posture Validation when doing NAC
Asymetric (public & Private key-pair)
1. application type 2. security capabilities 3. QoS policy
Only when all the RADIUS servers defined globally are unreachable. (ie. even if not called out under WLAN-->AAA - the global RADIUS servers will be used instead of local profile)

32. What are the 4 main components of NGS re: guests
mping = tests intercontroller control traffic. eping = tests intercontroller data traffic (EoIP)
ACL - or Interface-name configured in ACS -1. Interface Configuration --> RADIUS (Cisco Airspace) and check off: Air-Qos-Level - Aire-DSCP - Aire-802.1p tag - Aire-Interface-name - Air-ACL-Name
1. Guest User 2. Sponsor 3. Network Enforcement Device (ie wlc) 4. NGS Server itself
uses TLS to secure other eap methods like certs - user/pass - smart cards. Identifies itself to client with certificate. Utilizes: fast reconnect (faster roaming w/ key caching) and server authentication

33. Encryption algorithm used by Certificates
1. CBC-DES 2. CFB-AES-128
1. Min. RSSI 2. Roam Hysterisis - how much higher than current RSSI compared to neighbor ap RSSI before roaming request initiates 3. Scan Threshold - How low the current RSSI must be for the client to start scanning for a better ap 4. Transition Time
Asymetric (public & Private key-pair)
mititgate non-802.11 attacks

34. Directed Roam Request
after .1x authentication user is forwarded to a splash page. This is done via RADIUS attribute
1. Temporal Key for Unicast 2. Key Confirmation Key (KCK) - used for group handshakes 3. Key Encryption Key (KEK) - for encrypting the group encyrption key used to derive the braodcast/multicast keys.
UDP 5246 & 5247
WLC sends a roam-request to a client when it can better serve that client on a different AP. Client can accept or ignore. CCXv4+

35. RADIUS UDP Ports
1. client begins in Quarenteen vlan & NAA sends posture assesment to NAS 2. assesment is verified against policies in NAM 3. If in compliance - client is moved to access vlan. If not - NAS sends remediation info to client 4 NAA guides user through re
100 local accounts max
Security --> Advanced --> CIDS --> Sensors
1812 - Authentication 1813 - Authorization

36. Briefly describe eap-mschapv2
on the WLC -1. Configure an Access vlan & check the quarentine vlan - giving it the quarentine vlan tag 2. on wired net connect the Quarenteen vlan to the untrusted NAS interface. 3. Connect the access vlan to the trusted int. on the nas 4. config sn
1. Captive Portal 2. NAA (agent installed on windows); auth twice (1 to radius 2 to nac) 3. NAA w/ SSO - user authss once. & wlc auths to nac on their behalf.
x509v3 certificate
used with PEAP for user/password authentication

37. What is a mobility list used for
on the WLC -1. Configure an Access vlan & check the quarentine vlan - giving it the quarentine vlan tag 2. on wired net connect the Quarenteen vlan to the untrusted NAS interface. 3. Connect the access vlan to the trusted int. on the nas 4. config sn
1. VLAN Mapping 2. WLAN Ordering 3. WLAN Configuration
when you want some wlcs to be part of the same mobility group - but not others.
what occurs as a client roams to new ap -WLC forwards cached PMK to AP. Client then forms a Pairwise Transient Key (PTK) via 4-way handshake w/ ap.

38. IAPP roaming protocol
mititgate non-802.11 attacks
on the WLC -1. Configure an Access vlan & check the quarentine vlan - giving it the quarentine vlan tag 2. on wired net connect the Quarenteen vlan to the untrusted NAS interface. 3. Connect the access vlan to the trusted int. on the nas 4. config sn
Inter Access Point Protocol uses UDP between aps to exchange information about new aps (announce) in the area and handoffs that have occurred when client roams
what must you ensure -1.Exportable 2.Server Auth Cert 3.Store cert in local cert store

39. Briefly describe peap
US: 1. HIPAA 2. GLBA 3. FFIEC 4. SOX 5. FIPS 6. NIAP Canada: 1. PIPEDA Japan: 1. JPIPA
uses TLS to secure other eap methods like certs - user/pass - smart cards. Identifies itself to client with certificate. Utilizes: fast reconnect (faster roaming w/ key caching) and server authentication
Inter Access Point Protocol uses UDP between aps to exchange information about new aps (announce) in the area and handoffs that have occurred when client roams
Clients download a key for their wlan - after auth - so they can understand that IE in the mgmt frame

40. Protocols used in wIPS
peap-mschapv2 - eap-tls - mfp-v1 - nac
1. RSSI 2. Duration 3. Client Count 4. No encryption 5. Managed SSID (ie UNLV) 6. SSID
1 AP per 15 -000 sq. feet.
1. CAPWAP 2. NMSP (network mobility services) 3. SNMP 4. SOAP/XML

41. Enhanced Neighbor list - E2E
WLC RADIUS server only works if passwords are sent in Clear-text from LDAP.
Allows intel clients to request a neighbor list at will.
what must you ensure -1.Exportable 2.Server Auth Cert 3.Store cert in local cert store
Check Shell(exec) then define roles as role1=MANAGEMENT role2=WLAN role3...etc

42. How does the Nac Appliance Agent (NAA) work cohesively with 802.1x
1. RSSI 2. SNR 3. Load-Ballancing
grouping WLCs or map areas - so Lobby ambassadors can create guest accounts only on certain wlcs
It handles .1x & NAC auth. with Single Sign on. WLC forwards RADIUS accounting messages (of EAPOL Success) to the NAC upon login - authing the client to nac - & then it goes through posturing
EAP-FAST with anonymous pac provisioning

43. 3 modes of radius fallback
when you want some wlcs to be part of the same mobility group - but not others.
1. udp 16666 for control traffic 2. IP Protocol 97 (EoIP) for client data traffic
1. Off (default) - moves down list and uses next server indefinately. 2. Passive -- Upon failure - server is marked as inactive for (300 seconds) then is put back in list and tried again (if its highest priority). 3. Active -- Actively probes failed
100 local accounts max

44. AAA override
AES-Key Wrap
enables Identity Based Netowrking (IBN) where wlan settings are changed per-user (qos - vlan - acls - or timeouts)
1. Create user acct. in IDS for each WLC in the viewer role 2. add the WLCs IP as an allowed host 3. Obtain the IPS TLS Fingerprint & add it to WLC 4. Enable the client exclusion policy on the WLAN 5. Set msg log level to Alerts to log IPS events
UDP 5246 & 5247

45. 2 different types of wIPS deployment
Corrospond to top-menu GUI items (wireless - security - monitor etc)
1. Integrated -- wIPS monitor mode aps are part of client-serving infrastructure 2. Overlay -- wIPS aps - WCS & WLCs are totally seperate
300ms
peap-mschapv2 - eap-tls - mfp-v1 - nac

46. NAC Deployment Types
1. Interfac Configuration --> RADIUS (IETF) --> check 64 (Tunnel Type) - 65 (Tunnel Medium Type) - 81 (Tunnel Private-group-id) 2. Navigate to Group Setup and enable the checkboxes for the previous attributes - where 64=VLAN - 65=802 - 81=<Vlan_tag>
1. In-band virtual gateway -- is at L2 and intercepts all traffic and re-tags the default/untrusted vlan to the trusted vlan - based on compliance 2. In-Band Real IP Gateway - is the gateway 3. Out-of-band virtual gateway (same is 1 - except traffic
1. Allow EAP-MSCHAPv2 2. Allow EAP-GTC 3. Check Posture Validation when doing NAC
grouping WLCs or map areas - so Lobby ambassadors can create guest accounts only on certain wlcs

47. How is IBN-QoS
ACL - or Interface-name configured in ACS -1. Interface Configuration --> RADIUS (Cisco Airspace) and check off: Air-Qos-Level - Aire-DSCP - Aire-802.1p tag - Aire-Interface-name - Air-ACL-Name
specifies fast bss transitions by allowing negotiations and requests for wireless resources to occur simultaneously. Does this by allowing for part of the key to be cached (server key) among the network - so full 802.1x auth. isnt required
Nac Guest Server - used for provisioning guest accts - detailed usage reporting - delivery of creds via emai/sms -
checking allow aaa over-ride in the wlan-->advanced.

48. Describe AP Assisted Roaming
uses TLS to secure other eap methods like certs - user/pass - smart cards. Identifies itself to client with certificate. Utilizes: fast reconnect (faster roaming w/ key caching) and server authentication
WLC sends a roam-request to a client when it can better serve that client on a different AP. Client can accept or ignore. CCXv4+
used with PEAP for user/password authentication
Clients send info re: previously associated aps to current ap - so it can use this information to inform current clients about neighboring aps. Requires CCXv2

49. Vlan pooling
assigning multiple vlans to single wlan - and users are dynamically mapped to one of the vlans in round-robin
1. Scanning - for other aps in the area 2. exchanging 802.11 auth messages (first from client then from ap) w/ the target ap 3. exchanging re-association messages with target ap 4. dot1x master key (PMK) negotiation 5. key derivation - 4way handshake
peap-mschapv2 - eap-tls - mfp-v1 - nac
enables Identity Based Netowrking (IBN) where wlan settings are changed per-user (qos - vlan - acls - or timeouts)

50. What is 802.11w?
PKI
MFP
no
on the WLC -1. Configure an Access vlan & check the quarentine vlan - giving it the quarentine vlan tag 2. on wired net connect the Quarenteen vlan to the untrusted NAS interface. 3. Connect the access vlan to the trusted int. on the nas 4. config sn