1Y0-230 · Question #122
How does the NetScaler communicate that IP-to-MAC address bindings have changed to the switches and routers on the network, when a NetScaler high availability (HA) pair failover occurs?
The correct answer is C. The NetScaler uses Gratuitous ARPs (GARPs) to update the devices on the network. Citrix Exam Code: , Exam Name: Citrix NetScaler 12 Essentials and Unified Gateway , VMware, Juniper, Check Point, LPI, Nortel, EXIN and so on. Our Slogan: First Test, First Pass. Help you to pass any IT Certification exams at the first try. You can reach us at any of the email…
Question
How does the NetScaler communicate that IP-to-MAC address bindings have changed to the switches and routers on the network, when a NetScaler high availability (HA) pair failover occurs?
Options
- AThe NetScaler uses Reverse ARP (RARP) to update the devices on the network
- BThe NetScaler uses Proxy ARP to update the devices on the network
- CThe NetScaler uses Gratuitous ARPs (GARPs) to update the devices on the network
- DThe NetScaler uses MAC-based Forwarding to update the routers
How the community answered
(56 responses)- A9% (5)
- B14% (8)
- C73% (41)
- D4% (2)
Explanation
Citrix Exam Code: , Exam Name: Citrix NetScaler 12 Essentials and Unified Gateway , VMware, Juniper, Check Point, LPI, Nortel, EXIN and so on. Our Slogan: First Test, First Pass. Help you to pass any IT Certification exams at the first try. You can reach us at any of the email addresses listed below. Any problems about IT certification or our products, you could rely upon us, we will give you satisfactory answers in 24 hours.
Topics
Community Discussion
5
Bao N.Mar 16, 2026C is the one here. When a NetScaler HA failover happens, the new primary blasts out Gratuitous ARPs so every switch and router on the network flushes its old ARP cache and maps the shared IP addresses to the new primary's MAC, which is exactly how the network learns about the ownership change without any manual intervention.
Nina C.Apr 3, 2026Yes, C is right. When the secondary NetScaler takes over, it sends out GARPs to tell all the switches and routers on the network "hey, this IP now lives at my MAC address," so traffic gets redirected to the new active node without anyone needing to manually flush their ARP tables.
Imani T.Mar 11, 2026C is right, and this is one of those questions where eliminating the wrong answers actually helps you lock it in faster. When failover happens and the secondary takes over as primary, it needs to let every switch and router in the broadcast domain know that those virtual IPs now belong to a different MAC address, and it does that by blasting out Gratuitous ARPs without anyone asking for them first. The key word in GARP is gratuitous, meaning unsolicited, which is exactly what you need here since no device on the network knows to ask. RARP goes the wrong direction entirely (MAC to IP, not IP to MAC), and Proxy ARP is about answering someone else's ARP request on their behalf, which is a completely different use case. If you see anything about HA failover and network awareness on this exam, think GARP first every single time.
Yusuf A.Mar 26, 2026RARP threw me off but yeah, new primary just blasts GARPs so switches update their tables, C.
Nina C.Mar 29, 2026Right, and what helped it click for me is that the GARP updates the host ARP caches too, not just the switch MAC address tables, so the whole forwarding path corrects itself at once.