Chapter 3 Flashcards
What is the AD of OSPF?
110
What is the AD of RIP?
120
What is the AD of a static route?
1
What is the AD of a directly connected route?
0
What is the AD of eBGP?
20
What is the AD of an internal EIGRP route?
90
What is the AD of IGRP?
100
What is the AD of IS-IS?
115
What is the AD of an external EIGRP route?
170
What is the AD of iBGP?
200
If there are two or more routes for a destination IP address, what metric is used to select the best route?
Longest prefix match
If two routes have the same prefix and subnet ID, how is the best route selected?
Lowest administrative distance
If two routes have the same prefix, subnet ID, and administrative distance, how is the best route selected?
Routing protocol metric
What are two examples of distance-vector routing protocols?
RIPv1, RIPv2, EIGRP
What metric does EIGRP use?
Number of hops + latency + bandwidth
What are two examples of link-state routing protocols?
IS-IS, OSPF
What is the command to add a static route?
(config)# ip route (ip address) (subnet mask) (next hop ip address)
What is a floating static route?
A static route that is used as a fallback for dynamically discovered routes
For OSPF configuration, which parameters must match on device configuration?
OSPF process ID
OSPF area
Hello/dead timers
What virtual MAC address is used for HSRP? version 2
0000.0c9f.fXXX
Which FHRP can support multiple vendors?
VRRP
What virtual MAC address is used for HSRP version 1?
0000.0c07.acXX
In OSPF, when do routers become full/adjacent neighbors?
When both routers have the same set of LSAs
In OSPF, when do routers become 2-way neighbors?
When both routers have exchanged their seen RIDs and have the same information
In what sort of network do OSPF routers not maintain a DR/BDR relationship?
Point-to-point
How is the router ID selected?
- Manual configuration
- Highest IP of router’s loopback interfaces
- Highest IP of router’s regular interfaces
What is the default OSPF network for a network using Ethernet or FDDI connections?
Broadcast
How does OSPF select a route when it learns multiple paths?
It devides a reference bandwidth by the actual bandwidth of the exiting interface to calculate the lowest cost
What is the benefit of using a loopback interface in an OSPF network?
Loopback interfaces are virtual and do not go down, thus providing stability
What is one task that is accomplished with the OSPF Hello protocol?
Dynamic neighbor discovery
maintaining neighbor relationships
What are two ways to configure OSPF on a router?
- router ospf (process id)
network (ip address, wildcard) area (area id) - interface (interface id)
ip ospf (process id) area (area id)
What command displays OSPF link states?
show ip ospf database
What algorithm is used to calculate the best route in OSPF?
Dijkstra
What virtual MAC address is used for VRRP?
0000.5e00.01XX
What virtual MAC address is used for GLBP?
0007.b400.XXYY
x - group ID
y - router ID
In FHRP protocols, what happens when the active router fails?
After the hold time, the standby/backup router becomes the new active/master router. When the old active/master router becomes active again, it does not take the role back unless you configure preempt on it.
What command would you use to check HSRP configuration?
show standby
In HSRP, if there is no priority configured for a standby group, what determines which router is active?
Router IP address
What is the terminology for VRRP routers?
Master, backup
What is the terminology for HSRP routers?
Active/standby
What is a network route?
A route to a network of more than one host
What is a host route?
A route to a single host
What is a default route?
Used for forwarding packets that have no route in the routing table. Also referred to as the gateway of last resort
What command can you use to look at the routing table?
show ip route
How is the next hop indicated in the routing table
It has “via” in front of it and is the second IP address listed in the route
What are the two numbers between IP addresses in the routing table in this format? [#/#]
administrative distance/metric
What is the IPv4 address and mask of a gateway of last resort?
0.0.0.0 0.0.0.0
What command can you use to see what kind of routing protocol is configured?
show ip protocols
What command can you use to verify the configured OSPF process number and router ID?
show ip protocols
What command can you use to verify the OSPF timers?
show ip ospf
What command can you use to show the OSPF-enabled interfaces?
show ip ospf interface
What command can you use to view OSPF neighbor ID and state?
show ip ospf neighbor
What types of OSPF network must be configured with the ospf neighbor command?
Non-broadcast
Point-to-multipoint
In OSPF, what is the cost of a 10 Mbps Ethernet link?
10
Who can a router in the DROTHER state establish adjacencies with?
DR
BDR
What is a recursive static route?
a route for which the next hop is learned from another routing look up
What is a fully specified static route?
A configured route with both an outbound interface and a next-hop IP address
What command enables IPv6 routing?
ipv6 unicast-routing
What are benefits to using EIGRP over RIP?
Unequal-cost load balancing
Support for networks up to 255 hops away
Rapid convergance
What is the default cost of Gigabit Ethernet in OSPF?
1
What is the default cost of Fast Ethernet (100 Mbps) in OSPF?
1
What is the default cost of Ethernet (10 Mbps) in OSPF?
10
What is the default reference bandwidth in OSPF?
100 Mbps
What command in OSPF is used to generate a default route?
default-information originate
What is true about the default route in OSPF?
Not created automatically, must be configured
default-information originate
What is true about load balancing in OSPF?
Cannot do unequal cost load balancing
You can configure maximum paths up to 16, or 4 by default
What is the order of OSPF neighbor states?
Down
Attempt
2-way
Exstart
Exchange
Loading
Full
What is the highest priority you can configure in OSPF?
255
