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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: WLAN Technology Basics | 10% | - WLAN networking architecture (AC + AP) - WLAN basic configuration and troubleshooting - WLAN overview and 802.11 standards - WLAN RF fundamentals (channels, bands) |
| Topic 2: Typical Campus Networking Solution | 5% | - Hierarchical network model (core, aggregation, access) - Campus network architecture design - Network reliability and redundancy design - Typical campus network deployment scenarios |
| Topic 3: Ethernet Technology Basics | 20% | - MAC address table and forwarding - Ethernet overview and frame structure - Link aggregation (LACP) - STP / RSTP / MSTP spanning tree protocols - VLAN principles and configuration - VLAN intercommunication (sub-interface, VLANIF) |
| Topic 4: Data Center Network Basics | 5% | - Data center fabric concepts (VXLAN, SDN) - Data center network architecture overview - Cloud computing and virtualization basics |
| Topic 5: IP Technology Basics | 25% | - DHCP principles and configuration - IPv4 addressing and subnetting - ICMP protocol - NAT (Network Address Translation) - OSPF fundamentals (single-area) - ACL (Access Control List) - Static routing and default routing - IPv6 basics and address types |
| Topic 6: Data Communication Network Basics | 10% | - Basic principles and operations of VRP (Versatile Routing Platform) - TCP/UDP principles - Basic network concepts, IP network architecture, and standardization organizations - ARP principles - Basic concepts and life cycle of campus network - Data forwarding process - OSI and TCP/IP protocol models and functions of each layer |
| Topic 7: Network Security and Services | 15% | - IPsec VPN fundamentals - AAA (Authentication, Authorization, Accounting) - Network security overview - FTP / TFTP and file management - Firewall basics and security zones - Network management protocols (SNMP, NTP) |
| Topic 8: Network O&M and Troubleshooting | 10% | - Common network fault diagnosis - Network maintenance tools (ping, tracert, display commands) - Network documentation and baselining - Troubleshooting methodology and process |
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NEW QUESTION # 103
PC1 at 192.168.1.1/24 and PC2 at 192.168.1.102/25 are directly connected using an Ethernet cable, and the physical status of their network ports are normal. They can directly communicate with each other although their masks are different.
Answer: A
Explanation:
Although the two PCs are physically connected and the link status is normal, IP communication requires both devices to be in the same logical subnet to communicate directly without a router.
PC1 uses 192.168.1.1/24, while PC2 uses 192.168.1.102/25, which places them in different subnet boundaries. Because their subnet masks differ, they are not in the same Layer 3 network, so direct communication is not guaranteed and generally not possible without routing or special configuration.
NEW QUESTION # 104
In an OSPF process, the default-route-advertise command advertises default routes to common OSPF areas. If the always parameter is not configured, the local routing table must have an active default route that does not belong to the OSPF process to advertise the default route to other network devices.
Answer: B
Explanation:
OSPF supports default-route advertisement to provide routers with a path toward destinations that are not explicitly represented in their routing tables.
The default-route-advertise command allows an OSPF router to advertise a default route into the OSPF domain.
Under normal operation without the always parameter, the device must have an eligible active default route available in its local routing table. This route is generally learned or configured outside the OSPF process performing the advertisement.
When the always parameter is configured, the router can advertise a default route regardless of whether the qualifying default route exists locally.
Default-route advertisement is particularly useful on enterprise edge routers that provide connectivity to external networks.
The command helps internal OSPF routers forward traffic toward external destinations without requiring individual routes for every remote network.
Therefore, the statement is TRUE.
NEW QUESTION # 105
The following ACL rule is configured on R1:
[R1] time-range working-time 8:00 to 18:00 working-day
[R1] acl name work-acl basic
[R1-acl4-basic-work-acl] rule deny source 192.168.1.0 0.0.0.255 time-range working-time
[R1-acl4-basic-work-acl] quit
According to the rule, hosts with source IP addresses on network segment 192.168.1.0/24 match the rule from
8:00 to 18:00 on workdays.
Answer: B
Explanation:
The configuration first defines a named time range, working-time, covering 08:00 through 18:00 on working days. It then creates a named basic ACL and applies a deny rule for source network 192.168.1.0/24 using wildcard mask 0.0.0.255, with the rule tied to that time range. A packet from any address in 192.168.1.0 through 192.168.1.255 satisfies the source-address portion of the rule. The time-range condition means the rule is active only during the defined working-time period on the device. Outside that period, this particular rule is not considered a match. A basic ACL is appropriate here because the match depends on source IPv4 address and time, both of which are supported basic-ACL conditions. Whether traffic is ultimately permitted or denied also depends on where the ACL is applied and on any other ACL rules, but the question asks only whether the specified source addresses match this rule during the stated working hours. They do. Therefore, the statement is TRUE and option A is correct.
NEW QUESTION # 106
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?
Answer: B
Explanation:
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.
NEW QUESTION # 107
With the continuous update and development of data center services, the architecture of general-purpose computing data center networks is also evolving. A cloud-based data center uses a cloud platform to centrally integrate resources and deliver compute, storage, and network services. Which of the following network architectures is used by such a data center?
Answer: D
Explanation:
Modern cloud data centers require horizontal scalability, high east-west bandwidth, virtualization support, and flexible tenant network extension. A spine-leaf physical topology provides predictable low-hop connectivity between leaf switches by connecting each leaf to the spine layer. VXLAN provides an overlay that can create large numbers of logical Layer 2 segments over the Layer 3 underlay and is well suited to virtualized and multi-tenant cloud environments. The combination of Spine-Leaf and VXLAN is therefore a standard architecture for cloud-based general-purpose data center networks. M-LAG with Eth-Trunk can provide device and link redundancy but does not by itself provide the scalable overlay architecture expected for a cloud fabric. PFC and ECN are lossless-network and congestion-management technologies rather than a complete general-purpose data center architecture. STP with VRRP represents more traditional Layer 2 redundancy and gateway protection and does not offer the same cloud-fabric scalability. Consequently, the architecture described in the question is Spine-Leaf + VXLAN, making option B correct.
NEW QUESTION # 108
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