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| Section | Objectives |
|---|---|
| Network Security Basics | - Access control lists (ACL) - Basic network security concepts |
| Routing Technologies | - Static routing - Dynamic routing fundamentals (OSPF basics) |
| IP Addressing and Subnetting | - IPv6 fundamentals - IPv4 addressing and subnet masks |
| Network Fundamentals | - Basic network topologies and devices - OSI and TCP/IP models |
| WLAN Basics | - Wireless networking fundamentals |
| IP Services | - DHCP and DNS concepts - NAT basics |
| Network Management and Troubleshooting | - Device management concepts - Basic troubleshooting tools and methods |
| Switching Technologies | - VLAN configuration and trunking - STP/RSTP concepts |
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NEW QUESTION # 70
When planning IPv4 addresses for a campus network, which of the following methods can you use to assign an IP address to the interface connecting the campus egress device to the WAN?
(Choose all that apply.)
Answer: A,B,D
Explanation:
For IPv4 WAN-facing interfaces in campus networks, valid address assignment methods include static configuration, DHCP-based dynamic allocation, and PPPoE for access authentication and address assignment in broadband scenarios. These are all standard IPv4 mechanisms for obtaining or configuring IP addresses on WAN interfaces.
SLAAC is an IPv6 stateless auto-configuration mechanism and is not used for IPv4 address assignment, so it is not applicable in this context.
NEW QUESTION # 71
On the OSPF network shown in the figure, all IP addresses can communicate with each other.
Then the following configurations are added on R1:
[R1] acl 3000
[R1-acl4-advance-3000] rule deny ip source 10.0.1.1 0.0.0.0
[R1-acl4-advance-3000] rule deny ip source 10.1.1.1 0.0.0.0
[R1-acl4-advance-3000] rule permit ip source 10.3.1.1 0.0.0.0
[R1-acl4-advance-3000] rule permit ip
[R1-acl4-advance-3000] quit
[R1] traffic classifier test
[R1-classifier-test] if-match acl 3000
[R1-classifier-test] quit
[R1] traffic behavior test
[R1-behavior-test] permit
[R1-behavior-test] quit
[R1] traffic policy test
[R1-trafficpolicy-test] classifier test behavior test
[R1-trafficpolicy-test] quit
[R1] interface GE 0/0/1
[R1-GE0/0/1] traffic-policy test outbound
[R1-GE0/0/1] quit
Which IP addresses of S1 can successfully ping 10.0.23.3? (Select all that apply)
Answer: A,B,C,D
Explanation:
All four addresses can successfully ping 10.0.23.3, so the correct answer is A, B, C, D.
The key point is that the traffic policy is applied outbound on GE0/0/1 of R1, which is the interface facing S1. When S1 pings 10.0.23.3, the echo request travels from S1 to R1 and then to S2. The return echo reply from 10.0.23.3 comes back to R1 and is then sent outbound on GE0/0/1 toward S1. Therefore, the traffic policy examines the reply packets, not the original ping request packets.
In those reply packets, the source IP address is 10.0.23.3, and the destination is one of S1's loopback addresses. The ACL rules denying 10.0.1.1 and 10.1.1.1 as source addresses do not match these reply packets, because those addresses appear as destination addresses, not source addresses. In addition, the ACL contains rule permit ip, which permits all remaining IP traffic. As a result, replies to all four S1 addresses are forwarded successfully, so every listed address can ping 10.0.23.3.
NEW QUESTION # 72
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: B
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 # 73
OSPF supports the division of a network into areas, each identified by an area ID that ranges from 0 to 255.
Area 0 is designated as the backbone area.
Answer: B
Explanation:
This statement is false because although Area 0 is indeed the backbone area , the statement about the area ID range is incorrect. In OSPF, the area ID is a 32-bit value , which can be represented either in decimal format or in IPv4 address format such as 0.0.0.0. It is not limited to the numeric range 0 to 255 .
For example, an area can be configured as 0, 1, 100, or in dotted-decimal form such as 0.0.0.1 or 0.0.0.10, depending on implementation and configuration style. HCIA-Datacom teaches that OSPF uses hierarchical area design to improve scalability, reduce SPF calculation scope, and optimize LSA flooding. The backbone area , which is Area 0, serves as the transit area connecting all non-backbone areas in a standard OSPF design. Therefore, the second part of the statement is correct, but the first part is wrong, making the entire statement false. This question tests whether the learner understands both the function of Area 0 and the actual format of OSPF area identifiers.
NEW QUESTION # 74
In TCP/IP-based end-to-end communication, only the source and destination hosts process the header information added at the transport layer. Routers along the path will definitely not process this information.
Answer: A
Explanation:
In the standard TCP/IP forwarding model, transport-layer headers such as TCP and UDP headers are added by the source host and are mainly interpreted by the destination host. Routers that forward packets between the source and destination operate primarily at the network layer , using the destination IP address in the IP header to make forwarding decisions. Therefore, under normal routing behavior, routers do not process transport-layer header information when deciding how to forward packets.
This is a key concept in layered communication. The source host encapsulates application data with a transport-layer header, then with an IP header, and finally with a data-link header. Each router along the path removes only the Layer 2 frame header, checks the Layer 3 destination IP information, decrements TTL, recalculates the IP header checksum when required, and forwards the packet. The transport-layer content remains unchanged in normal forwarding. HCIA-Datacom uses this principle to explain end-to-end communication and layer responsibilities. Although advanced devices may inspect higher-layer information for security or policy purposes, standard router forwarding in the basic TCP/IP model does not depend on transport-layer processing.
NEW QUESTION # 75
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