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| Section | Objectives |
|---|---|
| Network Fundamentals | - Basic network components and operations - OSI and TCP/IP models |
| Network Services | - NAT - DHCP |
| IPv4 and IPv6 | - IPv6 addressing and deployment - IPv4 addressing and subnetting |
| Network Security Basics | - Basic device security configuration - Access Control Lists (ACL) |
| QoS and Traffic Management | - QoS concepts and mechanisms |
| IP Routing | - OSPF routing protocol - Static routing - BGP fundamentals |
| Ethernet Switching | - MAC address learning and forwarding - Spanning Tree Protocol (STP/RSTP/MSTP) - VLAN configuration and operations |
1. As shown in the figure, SWA and SWB enable STP, and SWC does not enable STP. Initially, link 2 is not connected, and PCB can send data to PCA. If link 1 fails at this time, the maintenance personnel connect link 2. Which of the following statement about the recovery process of data transmission from PCB to PCA is (assuming that PCA will not actively send data) is correct?
A) Since SWB port EO/1 takes 30 seconds to enter the forwarding state by default, the service takes 30 seconds to recover by default.
B) Service recovery requires waiting for the MAC address of the SWC to age, so the default time is 300 seconds.
C) When SWB port EO/1 enters the Forwarding state, it triggers the topology change process, so the service will eventually recover in the default time of 30+15=45 seconds.
D) Since the SWA link interruption will trigger the topology change process, the MAC address aging time of SWA and SWB will be shortened, so the service recovery takes 15 seconds by default.
2. In the PIM-DM network shown in Figure 189, some unicast routing tables of routers RT1 and RT2 are as follows:
<RT1>display ip routing-table Routing Tables: Public
Destination/MaskProtoPreCost NextHop Interface 10.1.1.0/30 Direct 0010.1.1.2Port1
Then, which of the following are outbound and inbound interface lists of the (S, G) entries of routers RT1 and RT2? (Multiple choice)
A) RT2 inbound interface list: Port1
B) RT1 inbound interface list: Port1
C) RT2 outbound interface list: Port2, Port3
D) RT1 outbound interface list: Port2, Port3
3. XYZ Company requires to build its network based on modular enterprise network architecture. XYZ Company has a research and development base in Shenzhen and Xi'an, an office building in Beijing and Shanghai, offices with more than 50 people in 23 provincial capitals, and technicians on business trips in
23 provincial capitals. Due to environmental and cost issues, some offices cannot connect to the headquarters through dedicated lines or packet switching wide area network connections. Based on these conditions, which of the following network module that XYZ Company should have? (Multiple choice)
A) Remote | Distributed Office Network
B) Large branch network
C) VPN access
D) Dedicated line and packet switching access
4. The customer's six switches SWA, SWB, SWC, SWD, SWE, and SWF are connected together through a LAN to form an RRPP ring. The RRPP status is checked on SWB as follows:
<SWB>dis rrpp verbose domain 1 Domain ID: 1
Ring ID: 1 Ring Level: 0
Node Mode: Transit Ring state: -
Enable Status: YesActive Status: Yes
Primary port: GigabitEthernet2/0/1 Port status: UP Secondary port: GigabitEthernet2/0/2 Port status: UP Ring ID :2 Ring Level: 1 Node Mode: Edge Ring state: - Enable Status: YesActive Status: Yes Common port: GigabitEthernet2/0/1 Port status: UP GigabitEthernet2/0/2 Port status: UP Edge port: GigabitEthernet2/0/3 Port status: UP Ring ID: 3 Ring Level: 1 Node Mode: Edge Ring state: - Enable Status: YesActive Status: Yes Common port: GigabitEthernet2/0/1 Port status: UP GigabitEthernet2/0/2 Port status: UP Edge port: GigabitEthernet2/0/4 Port status: UP What can we learn from the above information?
A) SWB is connected to 3 sub-rings
B) SWB is the transit node of RRPP sub-ring 2
C) GigabitEthernet2/0/4 is the edge port of RRPP sub-ring 3
D) GigabitEthernet2/0/1 is the edge port of RRPP sub-ring 2
5. In the switching network shown in the figure, VLAN 10 is set as lsolate-user- vlan on switch SWA, and VLAN 2 and VLAN 3 are secondary VLANs of VLAN 10; VLAN 2 and VLAN 20 are created on switch SWB, and VLAN 20 is set as lsolate-user-vlan, and VLAN 4 is secondary VLAN of VLAN 20. After setting the IP addresses of each device as shown in the figure, which of the following statement is correct?
A) PCA's message enters from SWA's GigabitEthem1/0/1 port and comes out from GigabitEthem1/0/3 port with the VLAN tag VLAN2.
B) SWB's message enters from SWA's GigabitEthem1/0/3 port, and the VLAN tag it carries after exiting from GigabitEthem1/0/3 port is VLAN20
C) When SWB accesses PCA, the VLAN tag of the message from SWB's GigabitEthem1/0/4 is VLAN10
D) PCA's message comes out of SWA's GigabitEthem1/0/ port and enters SWB's GigabitEthem1/0/4 port. The VLAN tag it carries is VLAN20.
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: B,D | Question # 3 Answer: C,D | Question # 4 Answer: C | Question # 5 Answer: D |
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