Integrated Routing and Bridging (IRB) JN0-364 Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A network engineer is explaining IRB to a customer. Which statement correctly describes the role of the routing instance in IRB?

   • AThe routing instance is required only for IRB interfaces that use dynamic routing protocols.
   • BThe routing instance provides the Layer 3 routing context for IRB interfaces, allowing them to route between VLANs.
   • CThe routing instance defines the VLAN-to-IRB mapping.
   • DThe routing instance is used to isolate Layer 2 traffic between VLANs.
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2. 2foundation · easy

   Which statement accurately describes how an IRB interface provides gateway functionality for a VLAN?

   • AIt forwards all broadcast traffic from the VLAN to other VLANs.
   • BIt replaces the need for a default gateway by using proxy ARP for all destinations.
   • CIt uses the VLAN's MAC address as the source for all routed traffic.
   • DIt provides an IP address that serves as the default gateway for hosts in the VLAN.
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4. 3application · medium

   A network administrator is troubleshooting why a host in VLAN 20 cannot reach the internet. The IRB interface for VLAN 20 is configured with IP 192.168.20.1/24, and the host's default gateway is set to 192.168.20.1. The host can ping the IRB interface. What should the administrator check next?

   • AThe routing table of the IRB interface for a default route.
   • BThe VLAN membership of the host's access port.
   • CThe IRB interface's MAC address.
   • DThe host's ARP cache.
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5. 4foundation · easy

   Which Junos CLI command would you use to verify that a specific IRB interface is correctly associated with a VLAN?

   • Ashow interfaces irb
   • Bshow arp
   • Cshow vlans
   • Dshow route table
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6. 5foundation · easy

   In a Juniper Networks environment, what function does an IRB interface perform for a VLAN?

   • AIt forwards frames between access ports in the same VLAN.
   • BIt acts as the Layer 3 routing interface for the VLAN, enabling routing to and from that VLAN.
   • CIt translates VLAN tags between 802.1Q and QinQ formats.
   • DIt provides a Layer 2 broadcast domain for the VLAN.
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