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| Section | Objectives |
|---|---|
| IPv6 | - IPv6 Fundamentals
|
| Network Reliability | - Reliability Technologies
|
| Routing Basics | - IP Routing Fundamentals
|
| Network Service and Management | - O&M Technologies
|
| WLAN | - Wireless Networking
|
| Routing and Traffic Control | - Traffic Management
|
| BGP | - BGP Technologies
|
| Ethernet Switching Technology | - Switching Fundamentals
|
| IS-IS | - IS-IS Fundamentals
|
| Network Solutions | - Enterprise Network Solutions
|
| Multicast | - IP Multicast Technologies
|
| OSPF | - OSPF Fundamentals
|
| Network Security | - Security Technologies
|
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NEW QUESTION # 69
When creating a security zone in the USG firewall, which of the following is the default security priority?
Answer: A
NEW QUESTION # 70
Which of the following LSAs are advertised only within a single area?
Answer: B,D
Explanation:
Router LSAs (Type 1) and Network LSAs (Type 2) are advertised only within a single OSPF area, as they describe the topology within the area. In contrast, Summary LSAs (Type 3) and AS External LSAs (Type 5) are used for inter-area and external routing, respectively .
NEW QUESTION # 71
On an OSPF network, if two routers with the same router ID run in different areas and one of the routers is an ASBR, LSA flapping occurs.
Answer: A
Explanation:
Understanding Router ID and Its Role in OSPF:
In OSPF, the Router ID uniquely identifies a router within the OSPF domain. If two routers are configured with the same Router ID, it can lead to issues such as LSA conflicts and flapping. This is because the Router ID is used as a key in OSPF operations, including LSA generation and database synchronization.
HCIP-Datacom-Core Technology Training Material (OSPF Basics - Router ID and LSA Handling).
Scenario Details:
Different Areas: Even if the two routers belong to different areas, the Router ID remains globally significant in the OSPF domain. This means that any duplication of Router IDs will confuse OSPF mechanisms.
ASBR (Autonomous System Boundary Router): When one of the routers is an ASBR, it generates Type 4 and Type 5 LSAs to describe external routes. These LSAs use the Router ID asan identifier. If another router in the network has the same Router ID, conflicts occur during LSDB synchronization.
Reference:HCIP-Datacom Advanced Routing & Switching Technology (LSA Types and ASBR Operations).
Impact of Router ID Duplication:
LSA Flapping: The OSPF process receives conflicting LSAs from routers with the same Router ID. This results in continuous updates and withdrawals of these LSAs, causing flapping.
Routing Instability: LSA flapping leads to frequent recalculations of the OSPF shortest path tree (SPT), affecting overall network stability.
Reference:HCIE-Datacom V1.0 Training Material (OSPF Troubleshooting and Best Practices).
Conclusion:
The statement isTRUE. LSA flapping occurs when two routers in an OSPF network have the same Router ID, even if they are in different areas and one is an ASBR. This is due to the global significance of Router IDs in OSPF and the role they play in LSA generation and propagation.
NEW QUESTION # 72
On an STP network, the root bridge, root port, and designated port are elected in sequence. The election rules of these ports are different. List the steps for electing the root port in sequence.
Answer:
Explanation:
A screenshot of a computer Description automatically generated
Explanation of Root Port Election in STP:
In a Spanning Tree Protocol (STP) network, theRoot Portis selected on each switch (except the Root Bridge).
The Root Port is the port with thelowest path costto the Root Bridge. If there is a tie in path cost, the following criteria are used in sequence to break the tie:
Steps for Root Port Election in Sequence:
RPC Comparison (Root Path Cost):
The port with thelowest Root Path Costis preferred.
Root Path Cost is the cumulative cost of the path to the Root Bridge.
Peer BID (Bridge ID) Comparison:
If the Root Path Costs are equal, theBridge IDof the connected switch (peer) is compared.
The port connecting to the switch with thelower Bridge IDis preferred.
Peer PID (Port ID) Comparison:
If the Bridge IDs are equal, thePort IDof the peer's sending port is compared.
The port connecting to thelower Port IDis preferred.
Local PID (Port ID) Comparison:
If all else is equal, theLocal Port IDof the switch is used.
The port with thelower Local Port IDis selected.
NEW QUESTION # 73
What packet types does OSPF include? (Multiple choice)
Answer: A,B,C
NEW QUESTION # 74
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