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질문 # 80
In the figure, a TCP connection has been established between PC1 and PC2. After PC1 sends a data segment to PC2, which of the following is the acknowledgment number in the packet returned by PC2?
정답：B
설명：
In TCP, the acknowledgment number indicates the next byte that the receiver expects to receive.
In the figure, PC1 sends a TCP segment to PC2 with sequence number = a+22 and payload length = 22 bytes. Since TCP sequence numbers count bytes, the last byte carried in this segment corresponds to sequence number a+43. Therefore, after PC2 successfully receives this data, it sends back an ACK indicating that the next expected byte is a+44.
That is why option B is correct. This is a standard TCP reliability mechanism. TCP does not acknowledge "packets" as units; it acknowledges the byte stream. The ACK number always points to the next byte expected from the peer. The source and destination port numbers identify the session, but the sequence and acknowledgment numbers track ordered delivery. HCIA- Datacom uses this mechanism to explain connection-oriented transport, reliable delivery, retransmission, and traffic control. Understanding how the payload length affects sequence progression is essential when analyzing packet captures and troubleshooting TCP communication problems in enterprise networks.
질문 # 81
The Protocol field in a packet's IP header identifies the upper-layer protocol that will continue to process the packet. For an ICMP packet, the Protocol field defaults to 0.
정답：A
설명：
The Protocol field in the IP header identifies the upper-layer protocol such as ICMP, TCP, or UDP. ICMP is identified by protocol number 1, not 0. Therefore, the statement that ICMP uses a default value of 0 is incorrect.
질문 # 82
Which of the following configurations can enable connectivity between interfaces on R1 and R3? (Select all that apply)
정답：B,C
설명：
For two directly connected edge networks to communicate through intermediate routing, each end router must have a route to the remote destination network pointing to the correct next hop on the transit link. Since
10.0.0.0/24 is directly connected to R1 and 20.1.1.0/24 is directly connected to R3, R1 needs a route to
20.1.1.0/24, and R3 needs a route to 10.0.0.0/24.
Option A is correct because it configures on R1 a static route to the remote network 20.1.1.0/24 using next hop 10.0.0.2, which is the neighbor toward the transit path. Option D is correct because it configures on R3 a static route to the remote network 10.0.0.0/24 using next hop 20.1.1.1, which is the proper adjacent forwarding address in that direction. Option B is incorrect because a router cannot use a next hop that belongs to the remote destination network but is not directly reachable as a valid immediate forwarding address in this topology. Option C is also incorrect because the specified next hop is not the correct adjacent next-hop address for R3. HCIA-Datacom stresses that static routes must always point to a reachable next hop or outbound interface.
질문 # 83
The following commands are configured on R1:
[R1] acl number 2001
[R1-acl-number-2001] rule permit source 172.16.105.0 0.0.0.255
[R1-acl-number-2001] rule deny source any
[R1-acl-number-2001] quit
[R1] ftp server acl 2001
According to the preceding configurations, only hosts with source IP addresses on network segment 172.16.105.0/24 cannot access the FTP service of R1.
정답：A
설명：
The FTP server ACL applied on R1 is used to control which source IP addresses are allowed to access the FTP service. According to the ACL:
172.16.105.0/24 is explicitly permitted
all other IP addresses are denied due to "deny source any"
However, the ACL is applied as an FTP server ACL, meaning only the permitted subnet is allowed to access FTP, and all others are denied. Therefore, the statement is incorrect because it says only 172.16.105.0/24 cannot access FTP, while in fact this subnet is the one that is allowed.
질문 # 84
The MAC address table of SW1 is shown in the figure. If SW1 receives a data frame with the destination MAC address 0050-5600-0004 from PC1, which of the following operations does SW1 perform on the data frame?
정답：C
설명：
SW1 looks up the destination MAC address 0050-5600-0004 in its MAC address table and finds it associated with interface GE1/0/4. Since this is a known unicast entry, the switch forwards the frame only out of the corresponding port instead of flooding it to all ports.
질문 # 85
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