CCNA Discovery 4.1 - CCNA Discovery Answers http://ccna-discovery-4.blogspot.com/ CCNA 4 Chapter 1 V4.0 Labels: CCNA 4 Chapter 1 V4.0 1 What are two mechanisms that provide redundancy for server farm implementations? (Choose two.) host intrusion prevention systems virtual private networks network intrusion prevention systems Rapid Spanning Tree Protocol Hot Standby Routing Protocol 2 The ability to connect securely to a private network over a public network is provided by which WAN technology? DSL Frame Relay ISDN PSTN VPN 3 Which three statements describe the functions of the Cisco hierarchical network design model? (Choose three.) Route summarization is not necessary at the core and distribution layers. The distribution layer is responsible for traffic filtering and isolating failures from the core. Two goals of the core layer are 100 percent uptime and maximizing throughput. The access layer provides a means of connecting end devices to the network. The distribution layer distributes network traffic directly to end users. CCNA Discovery 4.1 - CCNA Discovery Answers http://ccna-discovery-4.blogspot.com/ The core layer usually employs a star topology. 4 A network designer is creating a new network. The design must offer enough redundancy to provide protection against a single link or device failure, yet must not be too complex or expensive to implement. What topology would fill these needs? star full mesh partial mesh extended star hub and spoke 5 Refer to the exhibit. If the firewall module has been correctly configured using best practices for network security, which statement is true about the security design for the network? Servers in the network are not protected from internal attacks. Servers in the DMZ are protected from internal and external attacks. Servers in the server farm are protected from internal and external attacks. Traffic from the external networks is not able to access the servers in the DMZ. 6 Which statement is true about a DMZ in a traditional network firewall design? A DMZ is designed to provide service for external access but not for internal access. Servers in the DMZ provide limited information that can be accessed from external networks. User access to the DMZ from the Internet and the internal network usually is treated the same way. All servers in the enterprise network should be located in a DMZ because of enhanced security measures. CCNA Discovery 4.1 - CCNA Discovery Answers http://ccna-discovery-4.blogspot.com/ 7 download and upload documents on the network file server. What network connection would be most cost efficient while still meeting the security and connectivity needs of this teleworker? dedicated leased line connection with a dialup backup link Frame Relay connection with a DSL backup link DSL VPN connection with a dialup backup link ATM connection with a DSL VPN backup link DSL connection with no backup link 8 Refer to the exhibit. The network administrator creates a standard access control list to prohibit traffic from the 192.168.1.0/24 network from reaching the 192.168.2.0/24 network while still permitting Internet access for all networks. On which router interface and in which direction should it be applied? interface fa0/0, inbound interface fa0/0, outbound interface fa0/1, inbound interface fa0/1, outbound 9 Refer to the exhibit. The server broadcasts an ARP request for the MAC address of its default gateway. If STP is not enabled, what is the result of this ARP request? Router_1 contains the broadcast and replies with the MAC address of the next-hop router. Switch_A replies with the MAC address of the Router_1 E0 interface. Switch_A and Switch_B continuously flood the message onto the network. CCNA Discovery 4.1 - CCNA Discovery Answers http://ccna-discovery-4.blogspot.com/ Switch_B forwards the broadcast request and replies with the Router_1 address. 10 What are two best practices in wireless LAN design to ensure secure wireless access to the corporate network? (Choose two.) Configure APs for broadcast SSID. Place APs as far apart as possible. Use a separate WLAN for employees. Configure WPA. Use wireless routers in all IDFs. 11 In a well-designed, high-availability network, which device significantly affects the most users if a failure occurs? desktop PC of the user large switch in the network core layer large switch in the network distribution layer small workgroup switch in the network access layer 12 Which two statements are true regarding network convergence? (Choose two.) In a large network, using the EIGRP or OSPF routing protocols rather than RIPv2 may improve convergence time. Using STP at the core layer improves convergence time by allowing the use of redundant links between devices. Route summarization improves convergence time by minimizing the size of the routing table. A full mesh topology improves convergence time by allowing load balancing. ACLs can be configured to improve convergence time. CCNA Discovery 4.1 - CCNA Discovery Answers http://ccna-discovery-4.blogspot.com/ 13 Centralizing servers in a data center server farm can provide which benefit over a distributed server environment? It keeps client-to-server traffic local to a single subnet. Servers located in a data center require less bandwidth. It is easier to filter and prioritize traffic to and from the data center. Server farms are not subject to denial of service attacks. 14 Refer to the exhibit. What effect does the ACL shown have on network traffic, assuming that it is correctly applied to the interface? All traffic to network 172.16.0.0 is denied. All TCP traffic is denied to and from network 172.16.0.0. All Telnet traffic from the 172.16.0.0 network to any destination is denied. All port 23 traffic to the 172.16.0.0 network is denied. All traffic from the 172.16.0.0 network is denied to any other network. 15 Which Cisco IOS function can be configured at the distribution layer to filter unwanted traffic and provide traffic management? virus protection spyware protection VPNs access control lists 16 What kind of ACL inspects outbound UDP, TCP, and ICMP traffic and allows inbound access only to traffic that belongs to these established sessions? CCNA Discovery 4.1 - CCNA Discovery Answers http://ccna-discovery-4.blogspot.com/ dynamic ACL time-based ACL reflexive ACL lock and key ACL 17 Which three functions are performed at the distribution layer of the hierarchical network model? (Choose three.) summarizing routes from the access layer allowing end users to access the local network providing the gateway of last resort for core layer devices preserving bandwidth at the access layer by filtering network functions isolating network problems to prevent them from affecting the core layer utilizing redundant links for load balancing to increase available bandwidth 18 Refer to the exhibit. Which two devices are part of the access design layer? (Choose two.) Edge2 ISP4 BR4 FC-AP FC-CPE-1 FC-ASW-2 19 What is true about implementing a centralized server farm topology? requires direct cabling from the MPOE to enhance the performance of servers CCNA Discovery 4.1 - CCNA Discovery Answers http://ccna-discovery-4.blogspot.com/ requires the addition of high-capacity switches to each workgroup provides defined entry and exit points so that filtering and securing traffic is easier allows for placement of workgroup servers at the access layer 20 Refer to the exhibit. What happens when Host 1 attempts to send data? Frames from Host 1 are dropped, but no other action is taken. Frames from Host 1 cause the interface to shut down, and a log message is sent. Frames from Host 1 are forwarded, but a log message is sent. Frames from Host 1 are forwarded, and the mac-address table is updated. 21 Which two considerations are valid when designing access layer security?(Choose two.) In a large wireless network, the most efficient method to secure the WLAN is MAC address filtering. DoS attacks are normally launched against end-user PCs and can be mitigated by installing personal firewalls on all company PCs. SSH is more secure than Telnet to administer network devices. Disabling unused ports on the switches helps prevent unauthorized access to the network. All Telnet passwords are at least 6 characters long. 22 What address can be used to summarize only networks 172.16.0.0/24, 172.16.1.0/24, 172.16.2.0/24, and 172.16.3.0/24? 172.16.0.0/21 172.16.0.0/22 172.16.0.0 255.255.255.248 172.16.0.0 255.255.254.0 CCNA Discovery 4.1 - CCNA Discovery Answers http://ccna-discovery-4.blogspot.com/ 23 Which two items in a physical WLAN design can be identified through a site survey? (Choose two.) the types of antennas that are required the encryption techniques that are required the access point hardware that is required the different levels of access that are required the connection reliability that is required 24 Refer to the exhibit. Which two statements correctly describe the benefits of the network access layer design that is shown? (Choose two.) If host A sends a broadcast message, only hosts in VLAN10 receive the broadcast frame. If host A attempts to transmit data at the same time as another host, only hosts in VLAN10 are affected by the collision. Segmenting all voice traffic on a separate VLAN facilitates the implementation of QoS. VLANs improve network performance by facilitating the use of route summarization. VLANs at the access layer help guarantee network availability by facilitating load balancing. 25 What are three ways to ensure that an unwanted user does not connect to a wireless network and view the data? (Choose three.) Disable SSID broadcasting. Configure filters to restrict IP addresses. Use authentication between clients and the wireless device. CCNA Discovery 4.1 - CCNA Discovery Answers http://ccna-discovery-4.blogspot.com/ Use NetBIOS name filtering between clients and the wireless device. Configure strong encryption such as WPA. Use a WEP compression method.