Subneting and vlsm ntpg
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VLSM allows a network administrator to utilize multiple subnet masks in the same IP address space. A /29 mask must be used to create eight smaller subnetworks from a /28 subnet, with each having two usable host addresses. The most efficient route summary that can be configured on Router3 to advertise the internal networks to the cloud is 192.1.1.0/23 and 192.1.1.64/23.
Subneting and vlsm ntpg
- 1. 1.) What does VLSM allow a network administrator to do? a) b) c) d) utilize one subnet mask throughout an autonomous system utilize multiple subnet masks in the same IP address space utilize IGRP as the routing protocol in an entire autonomous system utilize multiple routing protocols within an autonomous system 2 marks 2.) A Class C network address has been subnetted into eight subnetworks. Using VLSM, the last subnet will be divided into eight smaller subnetworks. What bit mask must be used to create eight smaller subnetworks, each having two usable host addresses? a) b) c) d) e) f) /26 /27 /28 /29 /30 /31 2 marks 3.) The routers in the diagram use the subnet assignments shown. What is the most efficient route summary that can be configured on Router3 to advertise the internal networks to the cloud? a) b) c) d) e) f) 192.1.1.0/26 and 192.1.1.64/27 192.1.1.128/25 192.1.1.0/23 and 192.1.1.64/23 192.1.1.0/24 192.1.1.0/25 192.1.1.0/24 and 192.1.1.64/24 3 marks
- 2. 4.) Router1 and Router2 shown in the topology have been configured with the no ip subnet-zero command. Which of the following valid VLSM network numbers could be used for the serial link between Router1 and Router2? (Choose two.) a) b) c) d) e) f) 192.168.1.0/30 192.168.1.4/30 192.168.1.8/30 192.168.1.96/30 192.168.1.138/30 192.168.1.190/30 2 marks 5.) Consider the network shown in the graphic. Which of the following IP addresses would be valid for a company that is leasing a single Class C network address and using VLSM for maximum efficiency? a) 200.1.1.64 /26 for the 50 users 200.1.1.128 /27 for the 25 users 200.1.1.176 /27 for the 10 users
- 3. 200.1.1.192 /30 for one pair of serial links 200.1.1.196 /30 for the second pair of serial links b) 200.1.1.0 /26 for the 50 users 200.1.1.80 /27 for the 25 users 200.1.1.96 /27 for the 10 users 200.1.1.128 /30 for one pair of serial links 200.1.1.132 /30 for the second pair of serial links c) 200.1.1.64 /26 for the 50 users 200.1.1.128 /27 for the 25 users 200.1.1.160 /28 for the 10 users 200.1.1.176 /30 for one pair of serial links 200.1.1.180 /30 for the second pair of serial links d) 200.1.1.0 /26 for the 50 users 200.1.1.64 /26 for the 25 users 200.1.1.128 /27 for the 10 users 200.1.1.192 /30 for one pair of serial links 200.1.1.192 /30 for the second pair of serial links 4 marks 6.) Refer to the graphic. Which of the following addresses is the most efficient summarization of the routes attached to Router A? a) b) c) d) e) f) 192.168.4.0 /20 192.168.0.0 /16 192.168.4.0 /24 192.168.8.0 /22 192.168.8.0 /29 192.168.8.0 /30 2 marks
- 4. 7.) Refer to the graphic. If the network is running OSPF, which subnetworks can be assigned to the serial links between Router2 and the other routers shown in the diagram? a) b) c) d) e) 192.1.1.4/30 and 192.1.1.8/30 192.1.1.32/30 and 192.1.1.160/30 192.1.1.96/30 and 192.1.1.100/30 192.1.1.160/30 and 192.1.1.164/30 192.1.1.192/30 and 192.1.1.196/30 2 marks 8.) The network 192.1.1.0 has been subnetted for a network design. The 192.1.1.16/28 subnet has been chosen for further subnetting to provide for point-to-point serial link addressing. How many serial link subnets can be created while minimizing the number of wasted addresses? a) b) c) d) e) f) 1 2 4 6 8 16 2 marks
- 5. 9.) The network shown in the diagram is having problems routing traffic. It is suspected that the problem is with the addressing scheme. What is the problem with the addressing used in the topology? a) The address assigned to the Ethernet0 interface of Router1 is a broadcast address for that subnetwork. b) The subnetwork configured on the serial link between Router1 and Router2 overlaps with the subnetwork assigned to Ethernet0 of Router3. c) The subnetwork assigned to the Serial0 interface of Router1 is on a different subnetwork from the address for Serial0 of Router2. d) The subnetwork assigned to Ethernet0 of Router2 overlaps with the subnetwork assigned to Ethernet0 of Router3. 2 mark 10.) Refer to the graphic. Which command will enter a static route to network 192.168.19.0 from router C? a) b) c) d) e) f) C(config)# ip route 192.168.19.0 192.168.17.1 C(config)# ip static-route 192.168.19.0/24 192.168.17.2 C(config)# ip route 192.168.17.1 255.255.255.0 192.168.19.0 C(config)# ip route 192.168.19.0 255.255.255.0 192.168.17.1 C(config)# ip route 192.168.19.0 0.0.0.0 192.168.17.2 C(config)# ip default-route 192.168.17.2 255.255.255.0 192.168.19.0 1½marks
- 6. 11.) The LAN devices are configured as shown in the diagram. Why are Host1 and Host2 unable to communicate? (Choose three.) a) b) c) d) A router is required to forward traffic between the hosts. The switch ports are on different VLANs. The VLAN port assignments must be contiguous for each VLAN. The host default gateway addresses must be on the same logical network. e) The switch IP address is on the wrong subnet. f) The hosts are configured on different logical networks 1½marks 12.) What does the router shown in the graphic provide to the network? (Choose three.) a) b) c) d) e) f) forwarding of packets between VLANs forwarding of broadcast frames between VLANs improved efficiency in bandwidth utilization connectivity of local hosts with remote resources elimination of VLAN configuration errors prevention of switching loops 1½marks
- 7. 13.) Which strategies can a company take to enhance network reliability through redundancy? (Choose two.) a) Eliminate single points of failure. b) Flood frames for unknown destinations. c) Send multiple frames to an end device. d) Design alternate routes to a destination. e) Forward MAC address tables to all switches on the network. f) Eliminate multiple paths to the same destination. 2 marks 14.) How does an Ethernet switch improve network performance? (Choose three.) a) b) c) d) e) f) allows multiple frames to be forwarded simultaneously decreases the number of broadcast domains increases network latency eliminates unnecessary broadcast frames reduces the size of collision domains increases the number of collision domains 1½marks 15.) ) How many collision domains will there be in the entire network shown in the graphic if Hub1 is replaced with a Layer 2 switch? a) b) c) d) e) f) 2 3 4 7 8 10 1 mark
- 8. 16.) Which interior routing protocols support VLSM? (Choose three.) a) OSPF b) RIP v1 c) RIP v2 d) EIGRP e) BGP f) IGRP 1½marks 17.) What is the purpose of a default route? a) A default route will cause packets addressed to unknown destination networks to be dropped. b) A default route will cause packets addressed to unknown destination networks to be sent to a designated router interface. c) A default route will cause packets addressed to known destinations to prefer a specified path to the destination network. d) A default route will direct packets for all destination networks to a designated router and router interface 1 mark 18.) Which of the following is the metric that OSPF uses to determine the best route to a destination network? a) b) c) d) administrative distance cost hop count link delay 1 mark 19.) Which cables are used to connect the PCs and networking devices shown in the graphic? (Choose three.)
- 9. a) b) c) d) e) f) straight-through cable from the switches to the workstations straight-through cable between the two switches straight-through cable from the router to the switches crossover cable from the router to the switches crossover cable between the two switches crossover cable from the switches to the workstation 1½marks 20.) Refer to the graphic. Consider the routing table. What is the purpose of the 128 shown in the following line and bolded in the graphic a) It is the OSPF metric, which is cost. b) It is the OSPF administrative distance. c) It is the value assigned by the Dijkstra algorithm that designates how many hops away the network is. d) It is the value assigned to an interface that is used by the DUAL algorithm to determine the metric. 1 mark 21.) The following command was added to a router's configuration: ip route 192.168.20.0 255.255.255.0 172.16.15.3. What will adding this command accomplish? (Choose two.) a) A default route will be created. b) A static route will be created. c) Information about the 192.168.20.0 network learned dynamically will be ignored as long as the static route exists. d) All packets with an unknown destination address will be forwarded out interface 192.168.20.245. e) The route will be added as a RIP route in the routing table 2 marks
- 10. 22.) Refer to the graphic. Which of the following commands is used to configure switch port 2 for the host on VLAN 2? a) (config)# interface fastethernet 0/2 (config-if)# switchport mode access (config-if)# switchport access vlan 2 b) (config)# interface vlan 2 (config-subif)# switchport mode access 2 c) (config)# interface vlan 2 (config-subif)# switchport mode trunk dot1q d) (config)# interface fastethernet 0/2 (config-if)# vlan 2 1½marks 23.) Which of the following are advantages to adding a switch to a network? (Choose two.) a) b) c) d) e) Switches decrease the size of broadcast domains. Switches create collision-free domains. Switches decrease network throughput. Switches establish permanent virtual circuits for communications. Switches allow full allocation of bandwidth 1 mark 24.) Which device provides connectivity between IP routed networks and subnetworks? a) b) c) d) switch bridge router active hub 1 mark
- 11. 25.) What type of connectivity (refer to point A in the graphic) is required between SW1 and SW2? Note that SW1 has VLANs 2, 3, 4, and 5 configured and SW2 has VLANs 5, 6, 7, and 8 configured. Also, the computers on the same VLAN need the ability to communicate with one another. a) b) c) d) e) access channel interVLAN intraVLAN trunk 1 mark 26.) A network administrator located at the East site needs to check the configuration of a switch located at the Corporate site. The show hosts command is entered on the East router but does not produce any output. Which command can be used to gain access to the Corporate LAN switch assuming the switch is assigned the IP address 172.16.15.5/24? a) dial Corporate 172.16.15.5 b) line vty 0 4 telnet c) telnet Corporate d) telnet 172.16.15.5 1 mark
- 12. 27.) Which of the following tasks must be completed to configure a router interface to setup the newly added network 192.168.10.64/27 and to advertise this network over RIP v2? (Choose three.) a) RIP v2 must be configured with the network command and the IP network number for the new network. b) RIP v2 must be configured with the network command and the IP host address and subnet mask for the newly activated interface. c) The router must be configured with the ip subnet-zero command so that this network can be added and advertised. d) A network host address and subnet mask must be applied to the newly activated interface. e) The routing protocol must be activated with the router rip and version 2 commands. f) RIP v2 must be configured on the other enterprise routers with an entry for the newly added network. 1½marks 28.) A network administrator is having problems with excessive collisions on the corporate network. If the network currently uses hubs, what is the most cost effective way to reduce collisions? a) b) c) d) add additional hubs replace hubs with switches replace hubs with access points add a router to every hub segment 1 mark 29.) Refer to the graphic. Both routers are configured using RIP v1. Both routers are sending updates about the directly connected routes. R1 can successfully ping the serial interface of R2. The routing table on R1 does not contain any
- 13. dynamically learned routes from R2, and the routing table on R2 shows no dynamically learned routes from R1. What is the problem? a) b) c) d) Subnetting is not supported by RIP v1. One of the routers needs a clock rate on the serial interface. CIDR is not supported by RIP v1. VLSM is not supported by RIP v1. 2 marks 30.) Refer to the graphic. Which commands would direct outbound traffic from R1 to the ISP and inbound traffic from the ISP to network 200.1.1.0? a) R1(config)# ip route 144.1.1.0 255.255.255.192 serial 0/0 ISP(config)# ip route 0.0.0.0 0.0.0.0 serial 0/1 b) R1(config)# ip route 0.0.0.0 0.0.0.0 serial 0/0 ISP(config)# ip route 0. 0.0.0 0.0.0.0 serial 0/0 c) R1(config)# ip route 0.0.0.0 0.0.0.0 serial 0/0 ISP(config)# ip route 200.1.1.0 255.255.255.0 serial 0/1 d) R1(config)# ip route 144.1.1.0 255.255.255.192 serial 0/0 ISP(config)# ip route 200.1.1.0 255.255.255.0 serial 0/1 2 marks