Admin Table of Contents
- 1 What OSPF priority range can be assigned to a router?
- 2 What is the default OSPF cost for FastEthernet assuming the default reference bandwidth )?
- 3 What is used to facilitate hierarchical routing in OSPF?
- 4 How does OSPF generate default routes?
- 5 How does OSPF choose best path?
- 6 What is a benefit of multi area hierarchical OSPF routing?
What OSPF priority range can be assigned to a router?
0 to 255
Setting Priority for the Selection of the Designated Router Default priority for an OSPF interface is 1. The range is from 0 to 255.
Which command is used to injects a default route into an OSPF network?
default-information originate
Any OSPF router can originate default routes injected into a normal area. The OSPF router does not create a default route into the OSPF domain by default. The ‘default-information originate’ command is required for OSPF to generate a default route. In our example above, router R1 is directly connected to the Internet.
What is the default OSPF cost for FastEthernet assuming the default reference bandwidth )?
Default cost of essential interfaces.
| Interface Type | bandwidth | Cost |
|---|---|---|
| Ethernet Link | 10Mbps | 10 |
| FastEthernet Link | 100Mbps | 1 |
| Serial Link | 1544Kbps(default) | 64 |
What protocol is used by Eigrp to transport its routing protocol information?
EIGRP uses Reliable Transport Protocol (RTP) to communicate with neighbors. When communicating with neighbors, EIGRP will first send out information to its neighbors using the multicast address of 224.0.
What is used to facilitate hierarchical routing in OSPF?
Answers Explanation & Hints: OSPF supports the concept of areas to prevent larger routing tables, excessive SPF calculations, and large LSDBs. Only routers within an area share link-state information. This allows OSPF to scale in a hierarchical fashion with all areas that connect to a backbone area.
What is OSPF priority used for?
Sets the priority of a router to determine the designated OSPF router for a network. A number between 0 and 255 that specifies the priority of this interface. Each broadcast and Non-Broadcast Multi-Access (NBMA) network has a designated router.
How does OSPF generate default routes?
To generate a default route, you use the default-information originate command. 0.0 into the OSPF domain, provided the advertising router already has a default route. You can advertise 0.0. 0.0 regardless of whether the advertising router already has a default route.
How OSPF injects a default route into a stub or totally stub area?
To ensure the reachability of AS external routes, the ABR will generate a default route and advertise the route to non-ABRs in the stub area. A totally stub area further limits the propagation of inter-area routes in this area because only one egress is available to transmit the data packets of the routers in the area.
How does OSPF choose best path?
If there are multiple routes to a network with the same route type, the OSPF metric calculated as cost based on the bandwidth is used for selecting the best route. The route with the lowest value for cost is chosen as the best route.
What protocol does OSPF use?
Open Shortest Path First (OSPF) is a routing protocol for Internet Protocol (IP) networks. It uses a link state routing (LSR) algorithm and falls into the group of interior gateway protocols (IGPs), operating within a single autonomous system (AS).
What is a benefit of multi area hierarchical OSPF routing?
Advantages of Multiarea OSPF: Smaller routing tables – Fewer routing table entries as network addresses can be summarized between areas. Reduced link-state update overhead. Reduced frequency of SPF calculations.