CCNA 4 Chapter 5 Exam Answers

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Exam Chapter 5 Questions and Answers CCNA 4 V6.0

What are three techniques for mitigating VLAN attacks? (Choose three.)

Mitigating a VLAN attack can be done by disabling Dynamic Trunking Protocol (DTP), manually setting ports to trunking mode, and by setting the native VLAN of trunk links to VLANs not in use.

Refer to the exhibit. Which command or set of commands will configure SW_A to copy all traffic for the server to the packet analyzer?

The local SPAN configuration requires two statements to identify the source and destination ports for the mirrored traffic. The statements must use the same session number. In this example, the source port is the port connected to the server (Gi0/1) and the destination port is the port attached to the packet analyzer (Fa0/7).

Which two protocols are used to provide server-based AAA authentication? (Choose two.)

Server-based AAA authentication uses an external TACACS or RADIUS authentication server to maintain a username and password database. When a client establishes a connection with an AAA enabled device, the device authenticates the client by querying the authentication servers.

Refer to the exhibit. Router R1 was configured by a network administrator to use SNMP version 2. The following commands were issued:

R1(config)# snmp-server community batonaug ro SNMP_ACL R1(config)# snmp-server contact Wayne World R1(config)# snmp-server host 192.168.1.3 version 2c batonaug R1(config)# ip access-list standard SNMP_ACL R1(config-std-nacl)# permit 192.168.10.3

Why is the administrator not able to get any information from R1?

The permit statement with the incorrect IP address is the reason why the administrator is not able to access router R1. The correct statement should be permit 192.168.1.3. The snmp-server location and snmp-server enable traps commands are optional commands and have no relation to the access restriction to router R1. The rw keyword does not need to be included in this case because the administrator just wants to obtain information, not change any configuration.

What is the function of the MIB element as part of a network management system?

The Management Information Base (MIB) resides on a networking device and stores operational data about the device. The SNMP manager can collect information from SNMP agents. The SNMP agent provides access to the information.

What are SNMP trap messages?

A GET request is a message that is used by the NMS to query the device for data. A SET request is a message that is used by the NMS to change configuration variables in the agent device. An NMS periodically polls the SNMP agents residing on managed devices, by querying the device for data by using the GET request.

Refer to the exhibit. A SNMP manager has IP address 172.16.1.120. The SNMP manager is unable to change configuration variables on the R1 SNMP agent. What could be the problem?

Because the SNMP manager is able to access the SNMP agent, the problem is not related to the ACL configuration. The SNMP agent configuration should have an access level configured of rw to support the SNMP manager set requests. The SNMP manager cannot change configuration variables on the SNMP agent R1 with only ro access. The IP address of the SNMP manager does not have to be 172.16.1.1 to make changes to the SNMP agent. The SNMP agent does not have to have traps disabled.​

Which protocol or service can be configured to send unsolicited messages to alert the network administrator about a network event such as an extremely high CPU utilization on a router?

SNMP can be used to collect and store information such as device CPU utilization. Syslog is used to access and store system messages. Cisco developed NetFlow for the purpose of gathering statistics on packets that are flowing through Cisco routers and multilayer switches. NTP is used to allow network devices to synchronize time settings.

Which statement describes SNMP operation?

An SNMP agent that resides on a managed device collects and stores information about the device and its operation. This information is stored by the agent locally in the MIB. An NMS periodically polls the SNMP agents that are residing on managed devices by using the get request to query the devices for data.

Refer to the exhibit. Based on the output generated by the show monitor session 1 command, how will SPAN operate on the switch?

A server (10.10.10.1) connects to Gi0/1 on switch SW_A. A packet analyzer is connected to port Fa0/7 of SW_A.

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Which protocol defines port-based authentication to restrict unauthorized hosts from connecting to the LAN through publicly accessible switch ports?

802.1x is an IEEE standard that defines port-based access control. By authenticating each client that attempts to connect to the LAN, 802.1x provides protection from unauthorized clients.

A network administrator issues two commands on a router:

The snmp-server enable traps command enables SNMP to send trap messages to the NMS at 10.10.50.25. This notification-types argument can be used to specify what specific type of trap is sent. If this argument is not used, then all trap types are sent. If the notification-types argument is used, then repeated use of this command is required if another subset of trap types is desired.

Which statement describes the function of the SPAN tool used in a Cisco switch?

To analyze network traffic passing through a switch, switched port analyzer (SPAN) can be used. SPAN can send a copy of traffic from one port to another port on the same switch where a network analyzer or monitoring device is connected. SPAN is not required for syslog or SNMP. SPAN is used to mirror traffic, while syslog and SNMP are configured to send data directly to the appropriate server.

What is the behavior of a switch as a result of a successful CAM table attack?

As a result of a CAM table attack, a switch can run out of memory resources to store MAC addresses. When this happens, no new MAC addresses can be added to the CAM table and the switch will forward all received frames to all other ports. This would allow an attacker to capture all traffic that is flooded by the switch.

What network attack seeks to create a DoS for clients by preventing them from being able to obtain a DHCP lease?

DCHP starvation attacks are launched by an attacker with the intent to create a DoS for DHCP clients. To accomplish this goal, the attacker uses a tool that sends many DHCPDISCOVER messages in order to lease the entire pool of available IP addresses, thus denying them to legitimate hosts.

A network administrator is analyzing the features supported by the multiple versions of SNMP. What are two features that are supported by SNMPv3 but not by SNMPv1 or SNMPv2c? (Choose two.)

SNMPv3 provides message integrity to ensure that a packet was not tampered with and authentication to determine if the message is from a valid source. SNMPv3 also supports message encryption. SNMPv1 and SNMPv2 do not support message encryption, but do support community strings. SNMPv2c supports bulk retrieval operation. All SNMP versions support the SNMP trap mechanism.

Which SNMP version uses weak community string-based access control and supports bulk retrieval?

Both SNMPv1 and SNMPv2c use a community-based form of security, and community strings are plaintext passwords. Plaintext passwords are not considered a strong security mechanism. Version 1 is a legacy solution and not often encountered in networks today.

What is a drawback of the local database method of securing device access that can be solved by using AAA with centralized servers?

The local database method of securing device access utilizes usernames and passwords that are configured locally on the router. This allows administrators to keep track of who logged in to the device and when. The passwords can also be encrypted in the configuration. However, the account information must be configured on each device where that account should have access, making this solution very difficult to scale.

The exhibit shows a network consisting of a router, two switches, a DHCP client host, an attacker host, and a DHCP server. Switch S1 shows four interface connections: G0/1 to the DHCP client, G0/22 to switch S2, G0/24 to router R1, and G0/23 to the DHCP server. The attacker host is connected to switch S2.Refer to the exhibit. Which interface on switch S1 should be configured as a DHCP snooping trusted port to help mitigate DHCP spoofing attacks?

When DHCP snooping is configured, the interface that connects to the DHCP server is configured as a trusted port. Trusted ports can source DHCP requests and acknowledgments. All ports not specifically configured as trusted are considered untrusted by the switch and can only source DHCP requests.

Which statement describes the RSPAN VLAN?

Remote SPAN (RSPAN) allows source and destination ports to be in different switches. RSPAN uses two sessions. One session is used as the source and one session is used to copy or receive the traffic from a VLAN. The traffic for each RSPAN session is carried over trunk links in a user-specified RSPAN VLAN that is dedicated (for that RSPAN session) in all participating switches.

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A network administrator has issued the snmp-server user admin1 admin v3 encrypted auth md5 abc789 priv des 256 key99 command. What are two features of this command? (Choose two.)

The command snmp-server user admin1 admin v3 encrypted auth md5 abc789 priv des 256 key99 creates a new user and configures authentication with MD5. The command does not use a secret encrypted password on the server. The command snmp-server community string access-list-number-or-name restricts SNMP access to defined SNMP managers.

Refer to the exhibit. What can be concluded from the produced output?

The output is produced in response to the show snmp community command. It displays the community string and any ACLs that may be configured. The show snmp command without any keyword does not display information relating to the SNMP community string or, if applicable, the associated ACL. Because the show snmp community command does not display the contact or location information, whether they are configured or not cannot be concluded.

What protocol is used to encapsulate the EAP data between the authenticator and authentication server performing 802.1X authentication?

Encapsulation of EAP data between the authenticator and the authentication server is performed using RADIUS.

What device is considered a supplicant during the 802.1X authentication process?

The devices involved in the 802.1X authentication process are as follows:
The supplicant, which is the client that is requesting network access
The authenticator, which is the switch that the client is connecting to and that is actually controlling physical network access
The authentication server, which performs the actual authentication

The exhibit shows a network topology. On the top, there are two routers, labeled R1 and R2. Under the two routers, there are two Layer 3 switches, labeled DS1 and DS2, . Under DS1 and DS2, there are three Layer 2 switches, labeled AS1, AS2, and AS3. Both R1 and R2 have two connections, one to DS1 and another to DS2. DS1 and DS2 each has three connections, one to AS1, one to AS2, and one to AS3. PC1 is connected on switch AS1 and PC2 is connected to switch AS2. There is a DHCP server connected on switch AS3.Refer to the exhibit. PC1 and PC2 should be able to obtain IP address assignments from the DHCP server. How many ports among switches should be assigned as trusted ports as part of the DHCP snooping configuration?

The DHCP snooping configuration includes building the DHCP Snooping Binding Database and assigning necessary trusted ports on switches. A trusted port points to the legitimate DHCP servers. In this network design, because the DHCP server is attached to AS3, seven switch ports should be assigned as trusted ports, one on AS3 toward the DHCP server, one on DS1 toward AS3, one on DS2 toward AS3, and two connections on both AS1 and AS2 (toward DS1 and DS2), for a total of seven.

When using 802.1X authentication, what device controls physical access to the network, based on the authentication status of the client?

The devices involved in the 802.1X authentication process are as follows:
The supplicant, which is the client that is requesting network access
The authenticator, which is the switch that the client is connecting and that is actually controlling physical network access
The authentication server, which performs the actual authentication


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