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| Section | Objectives |
|---|---|
| WLAN Basics | - Wireless networking fundamentals |
| IP Services | - NAT basics - DHCP and DNS concepts |
| IP Addressing and Subnetting | - IPv4 addressing and subnet masks - IPv6 fundamentals |
| Switching Technologies | - STP/RSTP concepts - VLAN configuration and trunking |
| Network Security Basics | - Access control lists (ACL) - Basic network security concepts |
| Network Management and Troubleshooting | - Device management concepts - Basic troubleshooting tools and methods |
| Network Fundamentals | - Basic network topologies and devices - OSI and TCP/IP models |
| Routing Technologies | - Dynamic routing fundamentals (OSPF basics) - Static routing |
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NEW QUESTION # 93
Which of the following variables defined in Python code is invalid?
Answer: A
Explanation:
In Python, variable names must follow identifier rules: they cannot start with a digit. The variable
2_r1 is invalid because it begins with the number 2, which violates Python naming conventions.
The other variables are valid because they either start with letters or underscores and follow proper identifier rules.
NEW QUESTION # 94
In the TCP/IP reference model, some application layer protocols require low latency and high efficiency while allowing partial data loss during data transmission. Which of the following application layer protocols fit this description? (Choose all that apply.)
Answer: A,C
Explanation:
TFTP and DNS are designed for fast, lightweight communication and typically use UDP, which prioritizes low latency and efficiency over reliability, allowing some data loss. HTTP and Telnet, on the other hand, require reliable, connection-oriented transmission (TCP), so they do not tolerate data loss and are not suited for this type of requirement.
NEW QUESTION # 95
On the network shown in the figure, GE1/0/1 of SW1 is an access interface and its PVID is VLAN 2. GE1/0/1 and GE1/0/2 of SW2 are access interfaces and their PVIDs are VLAN 3. The interfaces connecting SW1 and SW2 are trunk interfaces that allow packets from VLAN 2 and VLAN 3 to pass through and retain the default PVID.
The administrator finds that PC2 can dynamically obtain an IP address from the DHCP server, but PC1 cannot. The administrator determines that a possible cause is that PC1 and the DHCP server are in different broadcast domains.
Answer: B
Explanation:
DHCP automatically assigns IP configuration parameters to network clients. During initial address acquisition, a DHCP client broadcasts a DHCPDISCOVER message to locate available DHCP servers.
Ethernet switches normally forward these broadcasts only within the originating VLAN.
In this scenario, PC1 belongs to VLAN 2, while PC2 and the DHCP server belong to VLAN 3. The trunk connection permits traffic from both VLANs but maintains their Layer 2 isolation.
Therefore, DHCP broadcasts generated by PC1 in VLAN 2 cannot directly reach the DHCP server in VLAN
3.
PC2 can obtain an address because it shares the DHCP server ' s broadcast domain.
Communication between these VLANs would require Layer 3 forwarding, and DHCP relay functionality would normally be required to forward DHCP requests across the VLAN boundary.
Consequently, the administrator ' s explanation is correct.
NEW QUESTION # 96
On the network shown in the figure, the interfaces connecting switches to terminals are access interfaces, and the interfaces connecting switches to each other are trunk interfaces. The administrator configures interface- based VLAN assignment. PC1 and PC3 belong to VLAN 2, and PC2 and PC4 belong to VLAN 3. Trunk interfaces allow packets from VLAN 2 and VLAN 3 to pass through and use the default PVID. The MAC address tables of switches are empty. When SW1 receives a unicast data frame sent from PC1 to PC3, through which of the following interfaces does SW1 not send the data frame?
Answer: A,B
Explanation:
PC1 and PC3 are members of VLAN 2, while PC2 and PC4 are members of VLAN 3. SW1 receives the frame from PC1 on access interface GE1/0/1 and associates it with VLAN 2. Because all switch MAC address tables are initially empty, PC3 ' s destination MAC address is unknown to SW1. The switch therefore floods this unknown unicast frame only through other interfaces that can carry VLAN 2. GE1/0/3 connects to PC3 in VLAN 2, so it is a valid flood port. GE1/0/4 is a trunk that permits VLAN 2 and VLAN 3, so it is also eligible to carry the VLAN 2 frame. SW1 does not send the frame back through GE1/0/1, the ingress interface, and it does not send it through GE1/0/2 because that access port belongs to VLAN 3. Therefore, the interfaces through which SW1 does not send the frame are GE1/0/2 and GE1/0/1, corresponding to A and D.
NEW QUESTION # 97
The following command output is displayed on R1:
[R1] display aaa configuration
Domain Name Delimiter : @
Domainname parse direction : Left to right
Domainname location : After-delimiter
Administrator user default domain : default_admin
Normal user default domain : default
Domain : total: 256 used: 3
Authentication-scheme : total: 32 used: 2
Accounting-scheme : total: 32 used: 1
Authorization-scheme : total: 32 used: 2
Service-scheme : total: 256 used: 0
Recording-scheme : total: 32 used: 0
Local-user : total: 512 used: 2
Remote-admin-user block retry-interval : 5 Min(s)
Remote-admin-user block retry-time : 3
Remote-admin-user block time : 5 Min(s)
Session timeout invalid enable : No
Which of the following statements is false?
Answer: C
Explanation:
The false statement is B. From the AAA configuration output, the value of Remote-admin-user block time is clearly shown as 5 Min(s), which means the account lockout duration is 5 minutes, not 30 minutes.
NEW QUESTION # 98
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