Flash Cards-Route Exam
To memories study questions for route exam
OSPF LSA Drop & Drag
- Stub - LSA 1,2,3
- NSSA - LSA 1,2,3,7
- Backbone or transit - LSA 1,2,3,4,5
- Totally NSSA - LSA 1,2,7
- Totally Stubby - LSA 1,2
BGP receives more than one route for a particular prefix (choose 3)
- paths that are marked as not synchronized in the sh ip bgp output
- paths for which the NEXT_HOP is inaccessible
- paths from an external BGP (eBGP) neighbor if the local (AS) appears in the AS_PATH
BGP Attributes
- MED Attribute - is propagated between AS
- Local Preference - is propagated throughout the local routers
- Weight - is not advertised to neighbor routers & used for one router with multiple exit points out of the AS
Implement load balance for traffic between hosts on 172.16.10.0/24 & 172.16.20.0/24 networks
include a task that establishes a baseline before & after config changes
Sh ip route (diagram)
- R1 is configured with the variance command
- A default route has been redistribute into the EIGRP AS
- R1 is configured with the ip summary-address command
OSPF Area 16 & Area 0 diagram
area 16 virtual-link 8.187.175.82
RIPv1, OSPF Area 0, OSPF Area 4, EIGRP AS1 diagram
- On the routing table of R4, the 10.1.1.0/24 route appears as an O E2 route
- On r4, the 172.16.1.0/24 route has a metric of 20
- The admin distance of the 172.16.1.0/24 route in the routing table of R3 is 170
OSPFv3 - which statement describes the configuration of OSPF areas
In interfaces configuration mode, the IPv6 OSPF process area ID combination assigns interface to OSPFv3 areas
Which command enable OSPF for IPv6 on a router
ipv6 router ospf process-id
3 statement about OSPF areas are true
- Areas introduce a boundary on the link-state updates
- All routers within an area have the exact link-state database
- The calculation of the Dijkstra algorthm on a router is limited to changes within an area
What is the purpose for configuring a router as a PPPoE Client
for DSL connectivity and removing the need for the user PC to run the PPPoE client software
Sh ipv6 neighbor
R1 used ICMP to learn about this neighbor
Which of the following is a GRE Tunnel characteristic
GRE tunnels can run through IPsec tunnels
AS 200 to be forward to AS300 (diagram)
IBGP speakers within AS 100 must be fully meshed and the synchronization must be turned off
Which 3 are characteristics of IPv6
- An IPv6 address is 128 bits long
- An IPv6 header contains the next header field
- IPv6 routers send RA messages
Which 2 EIGRP routes will be seen in the routing table of router R3
10.10.10.0/24 & 172.16.0.0/16
Which OSPF feature best achieve this goal (diagram)
Totally stubby
Which 3 neighbor IP address are valid choices to use in the highlighted section (diagram)
- 0A43:0002
- 10.67.0.2
- 0:0:0:0:0:0 10.67.0.2
Which 3 statement are true when redistribution for OSPF
- the default metric is 20
- the default metric-type is 2
- subnets do not redistribute by default
Which 3 statement are true regarding EIGRP
- by default, EIGRP performs auto-summarization across classful network boundaries
- to speed convergence, EIGRP attempts to maintain a successor and feasible successor path for each destination
- EIGRP uses hellos to establish neighbor relationships
Which sh command will display only type 5 LSAs in the OSPF topology database
Sh ip OSPF database external
What best describes a type 9 LSA? What should you tell her
Intra-area prefix LSA
Which 2 network does the core 1 device have feasible successor for?
- 17.0.0/30
172. 17.3.128/25
Which statement is true about the ipv6 address that can be included into the OSPF process?
Specific address cannot be selected for importation into the OSPF process
Which advantages to creating multiple area in OSPF (choose 3)
- less frequent SPF calculations
- smaller routing tables
- reduces LSU overhead
What 2 statement must be true (choose 2)
- Sh ipv6 OSPF interface
- interface Ethernet 0/0 has been configured with the ipv6 OSPF authentication IPSec spi 500 md5 command
- OSPF version 3 is enabled to support ipv6
Which 3 statements are true?
- sh ip route
- R1is configured with the variance command
- A default route has been redistributed into the EIGRP AS
- R1 is configured with the ip summary- address command
What are 2 rules for compacting ipv6 address (choose 2)
- The leading zeroes in any 16-bit segment do not have to be written
- Any single continuous string of one or more 16-bit segments that consists of all zeroes can be represented with a double colon
Which of the following are methods EIGRP uses to initially populate (seed) it’s EIGRP topology table, before learning topology data from. Neighbors (choose 2)
- By adding the subnets of working interfaces over which static neighbors have been defined
- By adding subnets redistribute on the local router from another routing source
Which 2 conditions can cause BGP neighbor establishment to fail (choose 2)
- There is an access list blocking all TCP traffic between the two BGP neighbors
- The BGP neighbor is referencing an incorrect AS number in its neighbor statement
Which 3 statements accurately describe the result of applying the exhibited route map?
- all routes that do not match clauses 10 and 20 of the route map are redistributed with their tags set to 8
- the map permits the redistribution of all type 1 external OSPF routes
- the map prohibits the redistribution of all type 2 external OSPF route with tag 6 set
What are the 4 main steps in configuring a GRE tunnel over IPsec on Cisco routers?
- configure a physical interface or create a loopback interface to use as the tunnel endpoint
- create the GRE tunnel interface
- add the tunnel subnet to the routing process so that it exchanges routing updates across that interface
- add GRE traffic to the crypto access-list, so that IPsec encrypts the GRE tunnel traffic
Which 2 statements are true about using ipv4 and ipv6 simultaneously on a segment?
- hosts can be configured to receive both ipv4 and ipv6 address via DHCP
- ipv6 allows a host to create its own ipv6 address that will allow it to communicate to other devices on a network configured via DHCP ipv4 does not provide a similar capability for host
When an OSPF design is planned, which implementation can help a router not have memory resource issues?
- have a backbone area ( area 0 ) with 40 routers and use default routes to reach external destinations
How should the virtual link be configured on the OSPF routers to establish full connectivity between the areas?
- R1# - area virtual-link 3.3.3.3
- R3# - area virtual-link 1.1.1.1
Which statement is true about OSPF network LSA?
They are originated by the DR on every multi-access network. They include all attached routers including the DR itself
Which 2 statement are correct regarding the routes to be redistributed into OSPF?
- the network 192.168.1.0 will be allowed and assigned a metric of 100
- all networks except 10.0.0.0/8 will be allowed and assigned a metric of 200
Place the BGP commands to the proper locations
- sh ip BGP - path selection values
- sh ip BGP summary - memory usage
- sh ip route BGP - AD of BGP
- sh ip BGP neighbor - notification, update
Which 2 statements are true about 6to4 tunnels
- in a 6to4 tunnel, the first 2 bytes of the ipv6 address will be 0x2002 and the next 4 bytes will be the hexes decimal equivalent of the ipv4 address
- in a 6to4 tunnel, the ipv4 address 192.168.99.1 would be converted to the 2002: c0a8:6301::/48 ipv6 address
Which 3 ipv6 overlay tunnel statements are true?
- overlay tunnels can be configured between border router or between a border router and a host capable of supporting ipv4 and ipv6
- Cisco iOS supports Manual, generic routing encapsulation (GRE), ipv4 - compatible, 6to4, and intra-site automatic tunnel addressing protocol (ISATAP) overlay tunneling mechanism
- overlay tunneling encapsulates ipv6 packets in ipv4 packet for delivery across an ipv4 infrastructure
which 3 steps are most helpful in verifying proper route redistribution
- On the routers not performing the route redistribution, use the sh ip route command to see if the redistributed routes show up
- ASBR router performing the route redistribution, use the sh ip protocol command
- -ASBR router performing the route redistribution, use the sh ip route command to verify tha the proper route from each routing protocol are there
Which is correct abut router C - diagram
it is configured and functioning correctly as an ABR attached to totally stubby area 4
what is the purpose of the eigrp stub configuration command
to increase scalability by limiting the eigrp query range
Implementation for OSPF project - drop & drag
- summarization boundaries
- OSPF process ID that will be used
- authentication type that will be used
- OSPF area and associated prefixes
what are 3 key concepts that apply when configuring the EIGRP stub routing feature in a hub and spoke network?
- Only remote routers are configured as stubs
- Stub routers are not queried for routes
- A stub router should have only EIGRP hub routers as neighbors
what optional EIGRP configurations will be required in order to achieve full connectivity within AS 100? - diagram
use the EIGRP no auto-summary command on R1 and R2
what are 3 reasons to control routing updates via routing filtering?
- to hide certain networks from the rest of the organization
- to control networks overhead on the wire
- for simple security
sh ip BGP summary - which 2 statements are true - diagram
- the bgp session to the 10.1.1.1 neighbor is established
- the router is attempting to establish a bgp peering session with the 10.2.2.2 neighbor
into which 2 types of areas would an area border router (ABR) inject a default route?
- stub
- totally stubby
what are 2 possible causes fro EIGRP Stuck-In-Active routers?
- some query or reply packets are lost between the routers
- A failure causes traffic on a link between 2 neighboring routers to flow in only one direction (unidirectional)
which 2 conditions can cause bgp neighbor establishment to fail?
- there is an access list blocking all TCP traffic between the 2 BGP neighbors
- the bgp neighbor is referencing an incorrect AS number in its neighbor statement
During a redistribution of routes from OSPF into EIGRP, an admin notices that none of the OSPF routes are showing EIGRP. What are 2 possible causes?
- incorrect distribute lists have been configure
- no default metric configured for EIGRP
which 2 statements are true about the partial configuration that is provided
- all the configured neighbors are in AS 100
- the peer group shortens the IBGP configuration
which 3 statements accurately describe the result of applying the exhibited route map
- all routes that do no match clauses 10 and 20 of the route map are redistributed with tags set to 8
- the map permits the redistribution of all type 1 external OSPF routes
- the map prohibits the redistribution of all type 2 external OSPF route with tag 6 set
The network design requires that R1 receive routin updates from R2, but not advertise any routes to R2. Which configuration command sequence will successfully accomplishment this task? (2 routers diagram)
R1# access-link 20 deny any
R1# router eigrp 1
R1# distribute-list 20 out serial 0
When policy-base routing (PBR) is being configured-which 3 criteria can the set command specify?
- all interfaces through which the packets can be routed
- adjacent next hop router in the path toward the destination
- type of service and precedence in the IP packets
which statement is true about about the command ipv6 ospf 1 area 0?
it must be issued in interface configuration mode to enable the OSPF process for IPv6
which 2 statements are true about IBGP neighbor relationship?
- A full mesh IBGP requires that neighbor relationships be established between all BGP enabled routers in the AS
- The BGP split horizon rule specificies that routes learned via IBGP are never propagated to other IBGP peers
