Dynamic Routing Protocols Flashcards
What 2 types of Routing Protocols make up IGP?
Distance Vector Routing Protocol and Link State Routing Protocol
What 2 protocols make up Distance Vector Routing Protocols?
RIP(v2) and EIGRP
What 2 protocols make up Link State Routing Protocols?
OSPF & ISIS
What type of Routing Protocol makes up EGP?
Path Vector Routing Protocol
What protocol makes up Path Vector Routing Protocol?
BGP
What is IGP used for?
Internal Routing within an organization
What EGP used for?
Routing between organizations over the internet
What is one of the main functions of Distance Vector Routing?
It is a dynamic routing algorithm in which each router computes distance between itself and each possible destination
What is convergence?
Convergence is when all routing protocol-specific information has been distributed to all routers participating in the routing protocol process.
What is Link State Routing Protocol?
It is a dynamic routing algorithm in which each router shares knowledge of its neighbors with every other router in the network.
What metric does OSPF use?
Cost
What does the cost metric do?
It uses bandwidth of the interface links to determine the best path for routing
What does the hop count metric do?
It calculates best path based on the number of hops
What metric does EIGRP use?
It uses cost and delay of links to calculate the metric
What is the maximum number of hops RIP uses by default?
15
What is the Administrative Distance of a Static Route
1
What is the Administrative Distance of a Connected Route?
0
What is the Administrative Distance of External BGP?
20
What is the Administrative Distance of EIGRP?
90
What is the Administrative Distance of OSPF?
110
What is the Administrative Distance of IS-IS?
115
What is the Administrative Distance of RIP?
120
What is a loopback interface?
It allows you to assign an IP Address to a Layer 3 device which is not tied to a physical interface
What is a default Route Injection?
It allows you to configure one default route on an outbound Layer 3 device and then advertise that static route via whichever routing protocol you’re using so that other L3 devices learn about it automatically
How many paths will RIP perform ECMP for?
4 by default
Does RIPv1 support VLSM?
No
Does RIPv2 use Broadcast or Multicast?
Multicast
What is a Hello packet?
A Hello packet is sent out and listened for when a routing protocol is enabled on an interface. It tells other routers to start forming adjacencies
What is a DBD Packet?
A DBD Packet is OSPF specific. It tells adjacent routers about the networks they know about
What is an LSR?
It’s a Link State Request. If a router is missing information about any of the networks received in a DBD packet, it will the neighbor an LSR
What is an LSA?
It’s a Link State Advertisement. This is a routing update that happens after a router sends an LSR
What is an LSU?
Link State Update. This contains a list of Link State Updates that will be used during an upcoming flood
What is LSAck?
It’s an acknowledgement that a router has received an LSA. If routers don’t an acknowledgement after sending a packet, they will resend it
How many Process ID’s are normally configured in an OSPF network?
1
Convert 255.255.255.0 into a Wildcard Mask
0.0.0.255
Convert 255.0.0.0 into a Wildcard Mask
0.255.255.255
Convert 255.255.0.0 into a Wildcard Mask
0.0.255.255
What command will show OSPF router adjacencies formed?
show ip ospf neighbors
What command will show the interfaces that OSPF is enabled on?
show ip ospf int brief
What are the commands to configure a passive interface on an OSPF router?
router ospf 1
passive-interface {interface}
What are the commands to enter a default route injection into OSPF?
ip route 0.0.0.0 0.0.0.0 {ip-address}
router ospf 1
default-information originate
What is the default priority on a router (as it relates to DR and BDR)?
1
