Which of the following descriptions about the Cluster List attribute in BGP is wrong?
Correct Answer: A
Question 392
Which of the following statements regarding BGP route advertisement are false?
Correct Answer: C
Question 393
On an OSPF network, one router with P2P as the network type is directly connected to another router with P2MP as the network type. If the Hello intervals on the two routers are changed to be the same, neighbor relationship establishment and LSDB synchronization are not affected.
Correct Answer: B
The scenario describes a mismatch in OSPF network types between two connected routers: one set to Point-to- Point (P2P) and the other set to Point-to-Multipoint (P2MP). While aligning Hello intervals may seem sufficient for establishing an OSPF neighbor relationship, the fundamental mismatch in network types introduces issues. * OSPF Network Types * P2P: Assumes a direct connection with a single neighbor, uses faster convergence and simpler LSDB synchronization. * P2MP: Supports multiple neighbors on a single interface, requiring different handling for DR /BDR roles and LSDB updates. * Impact of Network Type Mismatch * If Hello intervals are aligned, adjacency establishment might occur. However, mismatched network types affect neighbor role assignment and LSDB synchronization. * P2P expects a direct link and would handle updates differently than P2MP, which assumes multiple neighbors. This leads to inconsistencies in route calculation and forwarding. * HCIP-Datacom-Core Reference * OSPF Basics and Configurationclearly outlines the criticality of consistent network type configuration for stable OSPF operation. * Lab examples in the HCIP Datacom Lab Guidefurther demonstrate the consequences of such mismatches, including unstable neighbor states and incomplete LSDB synchronization. Hence, the statement that neighbor relationships and LSDB synchronization remain unaffected is incorrect. Proper OSPF operation requires matching network types in addition to aligned Hello intervals.
Question 394
Which of the following attributes must be carried when BGP sends route update messages?
Correct Answer: B,C
* Mandatory BGP Attributes * Next_Hop: Specifies the next hop to reach the destination. * AS_Path: Lists the autonomous systems traversed, crucial for loop prevention and route selection. * Optional Attributes * MED (Multi-Exit Discriminator) and Local_Preference are optional attributes that aid in route preference but are not mandatory. * HCIP-Datacom-Core Reference * BGP attribute behavior and classifications are detailed in BGP path selection principles.
Question 395
Which of the following statements about WLAN roaming are false?
Correct Answer: C,D
During WLAN roaming, the STA sends aReassociation Requestframe to the foreign AP to maintain connectivity. Association frames are used during initial connections, not roaming. APs with which a STA is associated before and after roaming can work on different channels, as roaming often occurs across channels in environments like multi-SSID or multi-channel setups. Options C and D are false, as they contradict standard WLAN roaming procedures .
