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| Section | Objectives |
|---|---|
| IPv6 and Network Services | - IPv6 routing technologies
|
| MPLS and VPN Technologies | - VPN technologies
|
| Advanced Routing Protocols | - OSPF Advanced Concepts
|
| Network Design and Troubleshooting | - Troubleshooting methods
|
| BGP and Internet Routing | - Advanced BGP features
|
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NEW QUESTION # 79
EGP authentication can prevent illegal routers from establishing neighbors with B, CP routers. B, CP authentication can be divided into MD5 Authentication and Keychain authentication, which of the following BGP documents will carry the B, CGP Keychain authentication letter interest? (header carry)
Answer: A,B,C,D
NEW QUESTION # 80
In the OSPF network shown in the figure, the area number has been marked in the figure, where area 1, area 2, and area 3 are all common areas. The IP address of the R5 Loopback0 interface is 10.0.5.5/32, and the interface is enabled with OSPF through the network method. ACL 2000 is configured on all routers, and the matching rules are shown in the figure.
In area 0 of R1, R2, and R3, "filte 2000 export" is configured. Which of the following routers' routing tables do not have a route entry for 10.0.5.5/32? (Multiple choice)
Answer: A,B,C,D
NEW QUESTION # 81
In the network shown in the figure, the DHCP Server function is enabled on the R2 GE0/0/0 interface, and the address pool is the interface address pool. The R1 GE0/0/0 and GE0/0/1 interfaces are used as DHCP clients. By default, only one interface can obtain an IP address.
Answer: A
NEW QUESTION # 82
Service routes of an enterprise are transmitted on the network. Some configurations of PE1 and PE2 are shown in the figure. Which of the following LSAs may CE2 receive?
Answer: B,C
NEW QUESTION # 83
On an enterprise network shown in the figure, if CE2 is dual-homed to PE2 and PE3, a routing loop may occur during the exchange of Type 5 LSAs (External LSAs in OSPF).
To prevent the loop, the route-tag command can be run on PE2 and PE3.
In this way, if the route tag of the route received by PE3 is the same as that configured locally, the route is ignored.
Is this statement True or False?
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding the Issue of OSPF Type 5 LSAs in a Dual-Homed CE Scenario
* OSPF Type 5 LSAs (External LSAs) are used in OSPF to advertise external routes, such as those learned via BGP or redistributed from another protocol.
* In a dual-homed CE setup, like the one in the figure, CE2 connects to both PE2 and PE3 using OSPF.
* PE2 and PE3 both redistribute BGP routes into OSPF and advertise them to CE2.
* CE2 then forwards these LSAs between PE2 and PE3, potentially causing a routing loop because each PE may re-learn its own previously advertised routes.
2. How Route Tags Prevent Loops in OSPF-BGP Redistribution
* The route-tag command assigns a tag to redistributed routes.
* When a router receives an external OSPF LSA (Type 5), it checks the route tag.
* If the route tag matches the locally configured tag, the router ignores the route to prevent loops.
Example Configuration on PE Routers:
plaintext
CopyEdit
PE2:
router ospf 1
import-route bgp 100 route-tag 65001
PE3:
router ospf 1
import-route bgp 100 route-tag 65001
* Both PE2 and PE3 tag their redistributed BGP routes with 65001.
* If PE3 receives an LSA from CE2 with the tag 65001, it ignores it (because it knows it originally advertised it).
# This prevents OSPF from incorrectly preferring a route that was originally sourced from itself, avoiding routing loops.
3. Evaluating the Answer Choices
# TRUE: If the route tag of the received route matches the locally configured tag, the route is ignored, preventing loops.# FALSE: The statement is correct, so False is incorrect.
Thus, the correct answer is: A. TRUE
Final Conclusion:
# The statement is TRUE because route tagging is a valid method to prevent OSPF Type 5 LSA loops in dual-homed scenarios.
NEW QUESTION # 84
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