Host intrusion prevention systems
Virtual private networks
Network intrusion prevention systems
Rapid Spanning Tree Protocol
Hot Standby Routing Protocol
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.
The core layer usually employs a star topology.
Hub and spoke
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.
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.
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
Interface fa0/0, inbound
Interface fa0/0, outbound
Interface fa0/1, inbound
Interface fa0/1, outbound
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.
Switch_B forwards the broadcast request and replies with the Router_1 address.
Configure APs for broadcast SSID.
Place APs as far apart as possible.
Use a separate WLAN for employees.
Use wireless routers in all IDFs.
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
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.
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.
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.
Access control lists
Lock and key ACL
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
Requires direct cabling from the MPOE to enhance the performance of servers
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
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.
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.
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
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.
Disable SSID broadcasting.
Configure filters to restrict IP addresses.
Use authentication between clients and the wireless device.
Use NetBIOS name filtering between clients and the wireless device.
Configure strong encryption such as WPA.
Use a WEP compression method.