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NEW QUESTION # 58
Which of the following port states are included in Rapid Spanning Tree Protocol (RSTP)?
Answer: A,C,D
Explanation:
RSTP (Rapid Spanning Tree Protocol) combines the Blocking, Listening, and Disabled states into Discarding, reducing the number of states to Discarding, Learning, and Forwarding. RSTP does not use a separate Listening state, as in standard STP.
NEW QUESTION # 59
Which of the following are features of the OSPF protocol?
Answer: A,C
Explanation:
Option B: OSPF supports triggered updates, allowing routing tables to be updated only when changes occur, conserving bandwidth.
Option D: OSPF supports area division, which is essential for optimizing large networks and limiting the scope of link-state advertisements.
NEW QUESTION # 60
Which of the following DHCPv4 messages are sent by a DHCPv4 server?
Answer: B,D
Explanation:
The normal DHCPv4 address-allocation exchange is commonly summarized as DORA: Discover, Offer, Request, and Acknowledge. A DHCP client that needs configuration begins by sending DHCPDISCOVER to locate available DHCP servers. A server responds with DHCPOFFER, proposing an address and other parameters. The client then sends DHCPREQUEST to indicate the offered address and server it has selected.
Finally, the selected DHCP server sends DHCPACK to confirm the lease and deliver the final configuration.
Therefore, DHCPDISCOVER and DHCPREQUEST are client-originated messages in the standard allocation process, while DHCPOFFER and DHCPACK are server-originated messages. DHCP also defines other messages for lease renewal, decline, release, and negative acknowledgment, but those are not among the answer choices. For the options provided, A, DHCPACK, and D, DHCP OFFER, are the messages sent by a DHCPv4 server. The verified answer is A and D. This server-versus-client message direction is fundamental when interpreting DHCP packet captures and troubleshooting address-allocation failures on enterprise campus access networks.
NEW QUESTION # 61
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: B
Explanation:
An IPv6 solicited-node multicast address is automatically derived from the lower 24 bits of a unicast or anycast IPv6 address. The fixed solicited-node prefix is FF02::1:FF00:0/104. The interface address in the question is 2001:db8:12::1. Its final 24 bits are 000001 in hexadecimal representation. Combining those 24 bits with the solicited-node multicast prefix produces FF02::1:FF00:1. This multicast address is used by IPv6 Neighbor Discovery for functions such as address resolution and Duplicate Address Detection, reducing the need to disturb every host on the local link in the way an IPv4 ARP broadcast does. FF02::1 is the all-nodes link-local multicast address and FF02::2 is the all-routers link-local multicast address, so neither represents the solicited-node group for this interface. Option A contains unrelated lower-order bits and does not correspond to the source address. Therefore the derived solicited-node multicast address is FF02::1:FF00:1, making option C correct.
NEW QUESTION # 62
DAD enables a node to detect whether an IPv6 address is already in use by another node before assigning it to an interface. This ensures that duplicate unicast addresses do not exist on a network. Which of the following packets are used for DAD? (Select all that apply)
Answer: A,B
Explanation:
Duplicate Address Detection (DAD) is an IPv6 mechanism used to verify that a unicast address is not already in use before the address is assigned to an interface. DAD is implemented using Neighbor Solicitation (NS) and Neighbor Advertisement (NA) messages, which are part of the ICMPv6 Neighbor Discovery protocol. Therefore, options A and D are correct.
When a host wants to verify a tentative IPv6 address, it sends an NS message for that address. If another node on the link is already using that address, that node responds with an NA message, indicating the address is duplicated and cannot be assigned. If no NA is received within the required period, the host assumes the address is unique and can use it.
NEW QUESTION # 63
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