PFE Tables
Question
The PFE receives which two tables from the RE? (Choose two.)
Answers
Explanations
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In Juniper Networks routers and switches, the Packet Forwarding Engine (PFE) is responsible for processing and forwarding network traffic. The Routing Engine (RE), on the other hand, is responsible for managing the control plane functions of the device such as routing protocols, management interfaces, and configuration files.
The RE maintains several forwarding tables that describe how packets should be forwarded through the network. When a packet arrives at the PFE, it consults these forwarding tables to determine the next hop for the packet.
The PFE receives two forwarding tables from the RE:
Layer 2 forwarding table: This table contains information about Layer 2 switching. It is used to forward Ethernet frames between interfaces on the device.
Layer 3 forwarding table: This table contains information about Layer 3 routing. It is used to forward IP packets between networks based on their destination IP addresses.
The Layer 4 forwarding table and Layer 5 forwarding table are not sent to the PFE. Layer 4 refers to the transport layer of the OSI model, which includes protocols such as TCP and UDP. Layer 5 refers to the session layer of the OSI model, which includes protocols such as SIP and FTP. These layers are typically handled by the RE and are not directly involved in packet forwarding.
