Cisco CCNA Routing Protocols and WAN

By Riley Santos · Updated May 25, 2026

Questions	24
Passing Score	75%
Format	58% Multiple Choice
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Catalog listing of the 5 preview questions for this quiz.

What is the purpose of a "null 0" (Null0) interface in Cisco routing?

A. A loopback interface for router management
B. A "bit-bucket" interface used to drop packets that match a route, preventing routing loops when using summary routes
C. An interface that connects to the ISP
D. An interface used for out-of-band management access

To configure OSPF on a Cisco router and advertise network 192.168.1.0/24 in Area 0 (backbone):

```

Router(config)# router ospf [[blank1]] (process ID — locally significant)

Router(config-router)# router-id [[blank2]] (manually set router ID for stability)

Router(config-router)# network 192.168.1.0 [[blank3]] area [[blank4]]

```

The wildcard mask for /24 (255.255.255.0) is [[blank5]].

What does "route summarization" (also called "route aggregation") accomplish?

A. It creates redundant paths between routers
B. It combines multiple specific routes into a single less-specific route, reducing routing table size and update traffic
C. It encrypts routing table entries for security
D. It automatically backs up routing table entries to a TFTP server

Which of the following describe WAN technologies used for enterprise connectivity? (Select THREE)

A. MPLS (Multiprotocol Label Switching) — provider-managed, uses labels for fast forwarding
B. Spanning Tree Protocol — creates redundant WAN paths
C. Metro Ethernet — carrier Ethernet service extending LAN technologies to WAN distances
D. SD-WAN (Software-Defined WAN) — centrally managed virtual WAN using multiple transport types
E. VTP (VLAN Trunking Protocol) — extends VLANs across WAN links

EIGRP uses the Dijkstra Shortest Path First (SPF) algorithm to calculate routes.