101 · Question #674
A BIG-IP Administrator wants to send packets from one subnet to another. What device is required to allow this to function?
The correct answer is B. Router. Routing traffic between different IP subnets requires a Layer 3 router, because Layer 2 devices such as switches and bridges can only forward traffic within the same network segment.
Question
A BIG-IP Administrator wants to send packets from one subnet to another. What device is required to allow this to function?
Options
- Aswitch
- BRouter
- CHUP
- DBridge
How the community answered
(39 responses)- B92% (36)
- C3% (1)
- D5% (2)
Why each option
Routing traffic between different IP subnets requires a Layer 3 router, because Layer 2 devices such as switches and bridges can only forward traffic within the same network segment.
A switch operates at OSI Layer 2 and forwards frames based on MAC addresses within the same VLAN or broadcast domain, so it cannot route packets between different IP subnets.
A router operates at OSI Layer 3 and uses IP routing tables to forward packets between different subnets by examining destination IP addresses and selecting the appropriate next-hop interface. Without a router, hosts on different IP subnets have no mechanism to communicate because all other listed devices lack Layer 3 awareness and cannot cross subnet boundaries.
A hub is a Layer 1 device that simply repeats electrical signals to all ports and has no awareness of IP addresses or subnets, making it completely incapable of inter-subnet forwarding.
A bridge connects two network segments at Layer 2 using MAC address learning, but like a switch it cannot route packets between different IP subnets.
Concept tested: Layer 3 routing between subnets using a router
Source: https://www.cisco.com/c/en/us/support/docs/ip/routing-information-protocol-rip/13788-3.html
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