ACSP Cheat Sheet 2026

The 30 highest-yield ACSP facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. What UDP destination port does VXLAN use by default for encapsulation, as standardized by IANA? → 4789
2. Two ArubaOS-CX switches are configured in a VRRP group with the same priority value and preemption disabled. Which switch will become the VRRP Master? → The switch with the higher IP address configured on the VRRP interface.
3. What is the IPv6 loopback address, equivalent to IPv4's 127.0.0.1? → ::1
4. In a network using 802.1X for port-based access control, what is the role of the ArubaOS-CX switch? → Authenticator
5. What is the primary purpose of IPv6 link-local addresses (FE80::/10)? → To enable communication between nodes on the same link without requiring a router
6. How does Aruba's intelligent traffic management feature work? → It automatically prioritizes traffic based on type
7. Which ICMPv6 message type does a router send periodically to inform hosts of network prefixes, the default gateway, and other configuration parameters? → Router Advertisement (type 134)
8. What is the total length of an IPv6 address? → 128 bits
9. Which AOS-CX command displays the IPv6 neighbor cache, equivalent to the IPv4 ARP table? → show ipv6 neighbors
10. What is the purpose of the Multicast Source Discovery Protocol (MSDP) in inter-domain multicast deployments? → To allow PIM-SM RPs in different administrative domains to share active source information
11. Which multicast address range is reserved for link-local scope and is never forwarded by routers? → 224.0.0.0 to 224.0.0.255
12. What is the main advantage of Aruba’s ClearPass solution? → It integrates with existing security infrastructure to manage access
13. Which version of IGMP introduced support for Source-Specific Multicast (SSM), allowing receivers to specify a source address? → IGMPv3
14. An IT department uses Aruba NetEdit to manage its fleet of ArubaOS-CX switches. What is a primary function of Aruba NetEdit? → Orchestrating multi-switch configuration changes with validation and auditing.
15. On AOS-CX, what two parameters are minimally required to configure a functional GRE tunnel interface? → A tunnel source IP address and a tunnel destination IP address
16. Which AOS-CX show command displays the multicast routing table with (S,G) and (*,G) entries? → show ip mroute
17. What is the primary role of a VTEP (VXLAN Tunnel Endpoint) in a VXLAN overlay network? → To encapsulate and decapsulate VXLAN packets at the network edge
18. In an Aruba AOS-CX VSX environment, what is the primary purpose of the keepalive connection? → To provide a heartbeat mechanism to detect a split-brain scenario when the ISL is down.
19. Which IPv6 transition technology transports IPv6 packets across an IPv4-only network by encapsulating them in IPv4 headers using protocol number 41? → IPv6-in-IPv4 tunneling (6in4)
20. How does an AOS-CX switch dynamically identify a port as an mrouter (multicast router) port when IGMP snooping is enabled? → By receiving IGMP queries or PIM hello messages on that port
21. Which EVPN route type carries MAC/IP advertisement information for individual host reachability? → Type-2 (MAC/IP Advertisement Route)
22. What is the purpose of Aruba’s AirGroup feature? → It facilitates device and resource sharing
23. What is the standard format of the virtual MAC address used by an IPv4 VRRP group? → 00-00-5E-00-01-{VRID}
24. Which IPv6 address type (FC00::/7) is analogous to IPv4 private address ranges such as RFC 1918? → Unique local addresses (FC00::/7)
25. Which protocol replaces ARP in IPv6 networks for resolving IPv6 addresses to MAC addresses? → ICMPv6 Neighbor Discovery Protocol (NDP)
26. Which AOS-CX command displays the multicast groups and associated member ports learned via IGMP snooping? → show ip igmp snooping groups
27. Which of the following is a key difference between VRRPv2 and VRRPv3? → VRRPv3 supports both IPv4 and IPv6, while VRRPv2 only supports IPv4.
28. In EVPN-VXLAN, which BGP address family is used to distribute MAC and IP reachability information between VTEPs? → L2VPN EVPN (AFI 25, SAFI 70)
29. What is the default, final action for any packet that does not match any of the configured entries in an ArubaOS-CX access control list? → Deny
30. Which well-known multicast address does IGMPv2 use to address the All-Routers group? → 224.0.0.2