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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. How is IBN-VLAN Selection implemted in ACS
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. disassociation 2. deauthentication 3.QoS (WMM)
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. udp 16666 for control traffic 2. IP Protocol 97 (EoIP) for client data traffic

2. Steps to setting up an out-of-band virtual gateway NAS setup
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
-150ms
WLC can detect 802.11 attacks - but not other attacks from valid wireless clients.
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

3. How is the CAPWAP tunnel between AP & WLC encrypted
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
mfp-v2
x509v3 certificate
1. HMAC-MD5 2. HMAC-SHA

4. Main elements of a NAC deployment
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. disassociation 2. deauthentication 3.QoS (WMM)
x509 cert to establish DTLS capwap control tunnel. It can be either 1. LSC 2. MIC (Mafctr installed cert) or 3. SSC
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

5. IAPP roaming protocol
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
grouping WLCs or map areas - so Lobby ambassadors can create guest accounts only on certain wlcs
1 AP per 15 -000 sq. feet.
same as steps to roaming in non-802.1R except: skips PMK negotiation & piggybacks PTK & QoS with the 802.11 authentication & association messages

6. Is data encrypted over a capwap tunnel?
WLCs create a deriviative of the PMK - called Opportunistic Key Caching (OPC) for fast-roaming among HREAPs in the same HREAP group.
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
Controll is (mgmnt) not data. To encrypt data: check data encryption under advanced tab of ap config
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

7. Eap process/messages
PKI
1. CAPWAP 2. NMSP (network mobility services) 3. SNMP 4. SOAP/XML
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
1812 - Authentication 1813 - Authorization

8. NAC Deployment Types
Sends the PMK to all WLCs that the client can roam to.
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
Asymetric (public & Private key-pair)
1. application type 2. security capabilities 3. QoS policy

9. Steps to adding an IPS
1812 - Authentication 1813 - Authorization
Sends RADIUS packets from a dynamic interface instead of the WLC Mgmt interface address
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
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

10. What CCX version is required for CCKM
mfp-v2
when you want some wlcs to be part of the same mobility group - but not others.
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. v2 - LEAP 2. v3 - EAP-FAST 3. v4 - PEAP & EAP-TLS

11. What is Ciscos gold confidence level deployment of wIPS aps in a walled environment
1. on NAS create an oob profile for the WLC 2. Create a new device in NAM - specifying the WLC mgmt ip 3. device mgmnt-->NAS & add the NAS ip as an oob virt. gateway 4. still on nams nas config page - enter the nas trusted int. ip & untrusted int vla
1 AP per 15 -000 sq. feet.
WLCs create a deriviative of the PMK - called Opportunistic Key Caching (OPC) for fast-roaming among HREAPs in the same HREAP group.
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.

12. Difference between mobility list and mobility group
used with PEAP for user/password authentication
1. LEAP 2. EAP-FAST
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
a mobility list can contain multiple mobility groups

13. Will foreign/anchor communication work through PAT?
1. HMAC-MD5 2. HMAC-SHA
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
Check Shell(exec) then define roles as role1=MANAGEMENT role2=WLAN role3...etc
no

14. How fast is fast secure roaming
mititgate non-802.11 attacks
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
x509v3 certificate
-150ms

15. How is IBN-QoS
1. CAPWAP 2. NMSP (network mobility services) 3. SNMP 4. SOAP/XML
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
MFP
mping = tests intercontroller control traffic. eping = tests intercontroller data traffic (EoIP)

16. What triggers can initiate a WLC to request a client to roam
WLC RADIUS server only works if passwords are sent in Clear-text from LDAP.
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. 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
AES-Key Wrap

17. Steps to setting up out-of-band virtual gateway setup on the NAS & NAM
US: 1. HIPAA 2. GLBA 3. FFIEC 4. SOX 5. FIPS 6. NIAP Canada: 1. PIPEDA Japan: 1. JPIPA
1. on NAS create an oob profile for the WLC 2. Create a new device in NAM - specifying the WLC mgmt ip 3. device mgmnt-->NAS & add the NAS ip as an oob virt. gateway 4. still on nams nas config page - enter the nas trusted int. ip & untrusted int vla
x509v3 certificate
what must you ensure -1.Exportable 2.Server Auth Cert 3.Store cert in local cert store

18. When submitting a CSR from ACS
what must you ensure -1.Exportable 2.Server Auth Cert 3.Store cert in local cert store
1. v2 - LEAP 2. v3 - EAP-FAST 3. v4 - PEAP & EAP-TLS
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
Security --> Advanced --> CIDS --> Sensors

19. What is the WLAN-->Advanced--> DIagnostic Channel used for
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. RSSI 2. SNR 3. Load-Ballancing
puts the ap and client through tests to isolate connection issues. This disables the wlan while doing this. Can be used to diagnose .1x auth - .11 association etc. if using ccxv5
a mobility list can contain multiple mobility groups

20. What kind of mgmt frames does client mfp protect
puts the ap and client through tests to isolate connection issues. This disables the wlan while doing this. Can be used to diagnose .1x auth - .11 association etc. if using ccxv5
after authentication - the client & radius server cache session keys for a configurable amount of time
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
1. disassociation 2. deauthentication 3.QoS (WMM)

21. Things to Enable in ACS (Global Authentication Page) for PEAP support
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)
1. Allow EAP-MSCHAPv2 2. Allow EAP-GTC 3. Check Posture Validation when doing NAC
Corrospond to top-menu GUI items (wireless - security - monitor etc)
1. RSSI 2. Duration 3. Client Count 4. No encryption 5. Managed SSID (ie UNLV) 6. SSID

22. How does infrastructure MFP work
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.
mititgate non-802.11 attacks
1. Guest User 2. Sponsor 3. Network Enforcement Device (ie wlc) 4. NGS Server itself
what must you ensure -1.Exportable 2.Server Auth Cert 3.Store cert in local cert store

23. What is Conditional Web Redirect
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
Security --> Advanced --> CIDS --> Sensors
after .1x authentication user is forwarded to a splash page. This is done via RADIUS attribute
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

24. What is the caveat to having redundant anchor controllers
clients are load ballanced between them - this can not be configured otherwise.
Sends RADIUS packets from a dynamic interface instead of the WLC Mgmt interface address
1. Integrated -- wIPS monitor mode aps are part of client-serving infrastructure 2. Overlay -- wIPS aps - WCS & WLCs are totally seperate
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

25. What are the 4 main components of NGS re: guests
when you want some wlcs to be part of the same mobility group - but not others.
1. Guest User 2. Sponsor 3. Network Enforcement Device (ie wlc) 4. NGS Server itself
RSN Tag. Auth Key mgmt will show PSK - or WPA (for 802.1x) Stands for Robust Security Network
MFP

26. How does CCKM simplify PMK Caching
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.
x509 cert to establish DTLS capwap control tunnel. It can be either 1. LSC 2. MIC (Mafctr installed cert) or 3. SSC
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
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.

27. How is IBN implemented on a WLAN
1. udp 16666 for control traffic 2. IP Protocol 97 (EoIP) for client data traffic
1. LEAP 2. EAP-FAST
checking allow aaa over-ride in the wlan-->advanced.
MFP-1 protects infrastructure from management frame attacks (ie aps only). MFP-2 Protects both infrastructure & clients

28. What does a wired IPS do compared to the WLC IDS
after authentication - the client & radius server cache session keys for a configurable amount of time
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)
clients are load ballanced between them - this can not be configured otherwise.
mititgate non-802.11 attacks

29. What does Fast Secure Roaming use re: Keying
uses certificates
Proactive Key Caching (PKC) or CCKM
peap-mschapv2 - eap-tls - mfp-v1 - nac
same as steps to roaming in non-802.1R except: skips PMK negotiation & piggybacks PTK & QoS with the 802.11 authentication & association messages

30. What kind of local 802.1x auth. does HREAP support
1 AP per 15 -000 sq. feet.
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
when you want some wlcs to be part of the same mobility group - but not others.
1. LEAP 2. EAP-FAST

31. 802.11R
1. CBC-DES 2. CFB-AES-128
Allows intel clients to request a neighbor list at will.
1. WLC must be defined as a VPN Conentrator - in the NAC config. 2. WLC must be configd to send RADIUS acct. to NAC
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

32. Steps to config. .1x for AP to WLC connections
1. Wireless-->AP Global Config-->enable dot1x w/ user/pass 2. Config the switch port to enable auth. to ACS/RADIUS
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. 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
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

33. WLC Tacacs+ roles
WLC RADIUS server only works if passwords are sent in Clear-text from LDAP.
x509 cert to establish DTLS capwap control tunnel. It can be either 1. LSC 2. MIC (Mafctr installed cert) or 3. SSC
US: 1. HIPAA 2. GLBA 3. FFIEC 4. SOX 5. FIPS 6. NIAP Canada: 1. PIPEDA Japan: 1. JPIPA
Corrospond to top-menu GUI items (wireless - security - monitor etc)

34. What is used for HREAP Roaming re: keying
300ms
WLCs create a deriviative of the PMK - called Opportunistic Key Caching (OPC) for fast-roaming among HREAPs in the same HREAP group.
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.
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

35. 3 categories of segmented traffic
when you want some wlcs to be part of the same mobility group - but not others.
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. application type 2. security capabilities 3. QoS policy
x509 cert to establish DTLS capwap control tunnel. It can be either 1. LSC 2. MIC (Mafctr installed cert) or 3. SSC

36. What does Proactive Key Caching do
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
US: 1. HIPAA 2. GLBA 3. FFIEC 4. SOX 5. FIPS 6. NIAP Canada: 1. PIPEDA Japan: 1. JPIPA
Sends the PMK to all WLCs that the client can roam to.
based on auth. group -1. vlan 2. qos 3. acl 4. tunnel attributes

37. Briefly describe eap-tls
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
mping = tests intercontroller control traffic. eping = tests intercontroller data traffic (EoIP)
used with PEAP for user/password authentication
uses certificates

38. What is needed to use Locally Significat Certificates (LSC) when establishing tunnel from OEAP to WLC
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
WLCs create a deriviative of the PMK - called Opportunistic Key Caching (OPC) for fast-roaming among HREAPs in the same HREAP group.
1. on NAS create an oob profile for the WLC 2. Create a new device in NAM - specifying the WLC mgmt ip 3. device mgmnt-->NAS & add the NAS ip as an oob virt. gateway 4. still on nams nas config page - enter the nas trusted int. ip & untrusted int vla
PKI

39. Switch global config to enable dot1x radius server
PKI
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>
1. udp 16666 for control traffic 2. IP Protocol 97 (EoIP) for client data traffic
no

40. How long before an HREAP goes into disconnected/standalone mode
used with PEAP for user/password 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+
Does not require re-authentication when a client roams - in an 802.1x/WPA2 environment
300ms

41. What is HREAP Local Auth limitation
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 authentication - the client & radius server cache session keys for a configurable amount of time
100 local accounts max
Clients download a key for their wlan - after auth - so they can understand that IE in the mgmt frame

42. What is NGS & whats it used for
WLC can detect 802.11 attacks - but not other attacks from valid wireless clients.
802.11i - 802.11r - 802.11w & 802.11n
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
Nac Guest Server - used for provisioning guest accts - detailed usage reporting - delivery of creds via emai/sms -

43. Describe AP Assisted Roaming
1. Integrated -- wIPS monitor mode aps are part of client-serving infrastructure 2. Overlay -- wIPS aps - WCS & WLCs are totally seperate
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
1 AP per 15 -000 sq. feet.
same as steps to roaming in non-802.1R except: skips PMK negotiation & piggybacks PTK & QoS with the 802.11 authentication & association messages

44. Difference between MFP-1 & MFP-2
checking allow aaa over-ride in the wlan-->advanced.
a mobility list can contain multiple mobility groups
MFP-1 protects infrastructure from management frame attacks (ie aps only). MFP-2 Protects both infrastructure & clients
1. WLC must be defined as a VPN Conentrator - in the NAC config. 2. WLC must be configd to send RADIUS acct. to NAC

45. RADIUS UDP Ports
1812 - Authentication 1813 - Authorization
1. RSSI 2. SNR 3. Load-Ballancing
Corrospond to top-menu GUI items (wireless - security - monitor etc)
PKI

46. How is encryption established between OEAP & Anchor WLC
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
x509 cert to establish DTLS capwap control tunnel. It can be either 1. LSC 2. MIC (Mafctr installed cert) or 3. SSC
300ms
EAP-FAST with anonymous pac provisioning

47. What does IBN allow you to assign
1. HMAC-MD5 2. HMAC-SHA
MFP-1 protects infrastructure from management frame attacks (ie aps only). MFP-2 Protects both infrastructure & clients
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>
based on auth. group -1. vlan 2. qos 3. acl 4. tunnel attributes

48. 3 modes of radius fallback
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
1. RSSI 2. SNR 3. Load-Ballancing
-150ms
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

49. How does the Nac Appliance Agent (NAA) work cohesively with 802.1x
mfp-v2
after authentication - the client & radius server cache session keys for a configurable amount of time
MFP
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

50. Encryption types used by SNMPv3
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
1 AP per 15 -000 sq. feet.
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. CBC-DES 2. CFB-AES-128