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| Section | Objectives |
|---|---|
| Topic 1: Switching Technologies | - STP/RSTP concepts - VLAN configuration and trunking |
| Topic 2: WLAN Basics | - Wireless networking fundamentals |
| Topic 3: Network Security Basics | - Access control lists (ACL) - Basic network security concepts |
| Topic 4: Routing Technologies | - Static routing - Dynamic routing fundamentals (OSPF basics) |
| Topic 5: IP Addressing and Subnetting | - IPv6 fundamentals - IPv4 addressing and subnet masks |
| Topic 6: Network Fundamentals | - Basic network topologies and devices - OSI and TCP/IP models |
| Topic 7: IP Services | - DHCP and DNS concepts - NAT basics |
| Topic 8: Network Management and Troubleshooting | - Basic troubleshooting tools and methods - Device management concepts |
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NEW QUESTION # 141
Which of the following descriptions regarding the TTL field of the IP packet is correct?
Answer: B
Explanation:
The Time to Live (TTL) field in an IP packet is decremented by 1 each time the packet passes through a router. When the TTL reaches zero, the packet is discarded to prevent it from circulating indefinitely.
NEW QUESTION # 142
Assume that the IPv6 address of GE0/0/0 on R1 is 2001:db8:12::1/64. Which of the following is the solicited-node multicast address of this IPv6 address?
Answer: D
Explanation:
A solicited-node multicast address in IPv6 is formed using the prefix FF02::1:FF00:0/104 combined with the last 24 bits of the IPv6 address. For 2001:db8:12::1/64, the last 24 bits are
000001, so the solicited-node multicast address becomes FF02::1:FF00:1.
NEW QUESTION # 143
The undo command can be used in the CLI of a Huawei device to restore default settings, disable functions, or delete configurations. Which of the following are correct undo commands? (Select all that apply)
Answer: A,B,C
Explanation:
On Huawei devices, the undo command is used to remove a previously applied configuration, disable a function, or restore a parameter to its default state. In option B , undo ip address is a valid interface-view command that removes the IP address configured on the interface. In option C , undo portswitch is also a valid interface command on switch interfaces that converts a Layer 2 interface into a Layer 3 interface when supported by the device. In option D , undo sysname restores the device name to the default hostname, which is valid in system view.
Option A is incorrect because system-view is a command used to enter system view from user view, but undo system-view is not a valid command for exiting that view. Exiting system view is done with commands such as quit, return, or by using shortcut keys. This question checks the understanding that undo only applies to configurable features and parameters, not to view-switching commands in the CLI hierarchy.
NEW QUESTION # 144
On a switched network where STP is enabled on all devices, when a downstream device detects a topology change, it continuously sends configuration BPDUs to the upstream device until the root bridge is informed of the topology change.
Answer: A
Explanation:
In STP, topology change information is propagated via TCN (Topology Change Notification) BPDUs, not by continuously sending configuration BPDUs. When a change is detected, the switch sends TCN BPDUs toward the root bridge through the upstream path, and the root bridge then informs the network using configuration BPDUs with updated flags. The behavior described is therefore incorrect.
NEW QUESTION # 145
A router ID uniquely identifies a device in an AS, and must be present before the device can run OSPF. For a device running OSPFv2, if no router ID is manually configured, the system automatically selects one.
Answer: B
Explanation:
In OSPFv2, a router ID is required for OSPF to operate and uniquely identifies each router within an AS. If no manual router ID is configured, the system automatically selects the highest IP address of a loopback interface; if no loopback exists, it selects the highest IP address of a physical interface. Therefore, the statement is correct.
NEW QUESTION # 146
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