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| Section | Objectives |
|---|---|
| Operations and Troubleshooting | - Monitoring and logging concepts - Basic network troubleshooting tools |
| Aruba Campus Access Architecture | - Aruba access layer components - Aruba OS-CX switching fundamentals - Campus network design principles |
| Networking Fundamentals | - IP addressing and subnetting - Basic switching and routing concepts - OSI model and TCP/IP basics |
| Wireless LAN Fundamentals | - Access point operation and roaming concepts - SSID and WLAN configuration basics - Wi-Fi standards and concepts |
| Security and Access Control | - Role-based access control - Network segmentation (VLANs, policies) - Authentication methods (802.1X) |
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질문 # 113
What is a weakness introduced into the WLAN environment when WPA2-Personal is used for security?
정답：A
설명：
The weakness introduced into WLAN environment when WPA2-Personal is used for security is that PMK Pairwise Master Key (PMK) is a key that is derived from PSK Pre-shared Key (PSK) is a key that is shared between two parties before communication begins, which are both fixed. This means that all users who know PSK can generate PMK without any authentication process. This also means that if PSK or PMK are compromised by an attacker, they can be used to decrypt all traffic encrypted with PTK Pairwise Temporal Key (PTK) is a key that is derived from PMK, ANonce AuthenticatorNonce (ANonce) is a random number generated by an authenticator (a device that controls access to network resources, such as an AP), SNonce Supplicant Nonce (SNonce) is a random number generated by supplicant (a device that wants to access network resources, such as an STA), AA Authenticator Address (AA) is MAC address of authenticator, SA Supplicant Address (SA) is MAC address of supplicant using Pseudo- Random Function (PRF). PTK consists of four subkeys: KCK Key Confirmation Key (KCK) is used for message integrity check, KEK Key Encryption Key (KEK) is used for encryption key distribution, TK Temporal Key (TK) is used for data encryption, MIC Message Integrity Code (MIC) key. .
The other options are not weaknesses because:
- It uses X 509 certificates generated by a Certification Authority: This option is false because WPA2- Personal does not use X 509 certificates or Certification Authority for authentication. X 509 certificates and Certification Authority are used in WPA2-Enterprise mode, which uses 802.1X and EAP Extensible Authentication Protocol (EAP) is an authentication framework that provides support for multiple authentication methods, such as passwords, certificates, tokens, or biometrics. EAP is used in wireless networks and point-to-point connections to provide secure authentication between a supplicant (a device that wants to access the network) and an authentication server (a device that verifies the credentials of the supplicant). for user authentication with a RADIUS server Remote Authentication Dial-In User Service (RADIUS) is a network protocol that provides centralized authentication, authorization, and accounting (AAA) management for users who connect and use a network service.
- The Pairwise Temporal Key (PTK) is specific to each session: This option is false because PTK being specific to each session is not a weakness but a strength of WPA2-Personal. PTK being specific to each session means that it changes periodically during communication based on time or number of packets transmitted. This prevents replay attacks and increases security of data encryption.
- It does not use the WPA 4-Way Handshake: This option is false because WPA2-Personal does use the WPA 4-Way Handshake for key negotiation. The WPA 4-Way Handshake is a process that allows the station and the access point to exchange ANonce and SNonce and derive PTK from PMK. The WPA 4- Way Handshake also allows the station and the access point to verify each other's PMK and confirm the installation of PTK.
References: https://en.wikipedia.org/wiki/Wi-
Fi_Protected_Access#WPA_key_hierarchy_and_management https://www.cwnp.com/wp- content/uploads/pdf/WPA2.pdf
질문 # 114
A network technician is troubleshooting one new AP at a branch office that will not receive Its configuration from Aruba Central The other APs at the branch are working as expected The output of the 'show ap debug cloud-server command' shows that the "cloud conflg received" Is FALSE.
After confirming the new AP has internet access, what would you check next?
정답：A
설명：
When an Aruba AP is not receiving its configuration from Aruba Central, and other APs at the location are functioning normally, a common troubleshooting step is to disable and then re-enable the activation process on the AP. This action can trigger a provisioning refresh, prompting the AP to attempt to retrieve its configuration from Aruba Central again. This step is often effective in resolving communication or provisioning issues between the AP and the management platform.
질문 # 115
What is the ideal Aruba access switch for a cost-effective connection to 200-380 clients, printers and APs per distribution rack?
정답：C
설명：
The Aruba CX 6300 Series is an ideal access switch for medium to high-density client environments, offering a range of models that can accommodate various port densities and types. For a distribution rack supporting
200-380 clients, printers, and APs, the CX 6300 provides the necessary port density and performance capabilities, including high-speed uplinks, support for Class 4 PoE (PoE+), and stacking capabilities. This series is cost-effective and designed for enterprises requiring reliable connectivity and consistent performance. The other options, such as the CX 6400, CX 6200, and CX 6000, may either be over-specified and more expensive (CX 6400), not offer the necessary port density (CX 6200), or not exist in the product line (CX 6000).
질문 # 116
Which protocol can be sent from an AOS-CX switch to provision DSCP and PoE settings to a connected VoIP phone?
정답：D
설명：
LLDP-MED (Link Layer Discovery Protocol - Media Endpoint Discovery) extends LLDP with capabilities specifically designed for VoIP devices. It allows an AOS-CX switch to advertise network policies such as voice VLAN information, DSCP/QoS settings, and PoE capabilities to connected IP phones, enabling automatic provisioning and optimized voice service.
질문 # 117
What does a slow amber-flashing Stack-LED indicate?
정답：D
설명：
A slow amber-flashing Stack-LED indicates that stacking mode is selected on the switch. This means that the switch is ready to join a stack or form a new stack if no other switches are present.References:https://www.
arubanetworks.com/techdocs/ArubaOS_86_Web_Help/Content/arubaos-solutions/1-overview/stacking-leds.
htm
질문 # 118
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