Which features extend VRFs across a campus? (Choose 2) - Exam 352-001: CCDE Written Exam | Cisco

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Virtual Routing and Forwarding (VRF) is a technology that allows multiple virtual routing tables to coexist on a single physical router or switch. Each VRF instance is independent of the others and has its own set of routes and forwarding tables, providing a layer of network separation and security.

To extend VRFs across a campus, we need to use a technology that can carry multiple VRFs over a single physical link or network. Here are the two features that can be used to achieve this:

1. 802.1q trunks:

802.1q is a protocol that provides VLAN tagging for Ethernet frames. By configuring a trunk port on a switch, we can carry traffic for multiple VLANs over a single physical link. In the context of VRFs, we can assign each VRF instance to a separate VLAN and carry those VLANs over the same trunk. This allows VRF traffic to traverse the campus network without mixing with traffic from other VRFs.

2. GRE:

Generic Routing Encapsulation (GRE) is a tunneling protocol that can be used to carry packets from one network over another network. In the context of VRFs, we can configure a GRE tunnel between two routers or switches and assign each VRF instance to a separate GRE tunnel. This allows VRF traffic to traverse the campus network as if it were on a separate physical link.

LDP, MPLS TE, and port channels are not features that can be used to extend VRFs across a campus. LDP and MPLS TE are protocols used for label switching and traffic engineering in MPLS networks, while port channels are used to aggregate multiple physical links into a single logical link. Although these technologies can be used in conjunction with VRFs, they do not directly extend VRFs across a campus.