ENSA 4 Flashcards
Which statement describes a characteristic of standard IPv4 ACLs?
They filter traffic based on source IP addresses only.
They can be created with a number but not with a name.
They are configured in the interface configuration mode.
They can be configured to filter traffic based on both source IP addresses and source ports.
They filter traffic based on source IP addresses only.
Explanation: A standard IPv4 ACL can filter traffic based on source IP addresses only. Unlike an extended ACL, it cannot filter traffic based on Layer 4 ports. However, both standard and extended ACLs can be identified with either a number or a name, and both are configured in global configuration mode.
Refer to the exhibit. R1 is configured for NAT as displayed. What is wrong with the configuration?
NAT-POOL2 is not bound to ACL 1.
Interface Fa0/0 should be identified as an outside NAT interface.
The NAT pool is incorrect.
Access-list 1 is misconfigured.
NAT-POOL2 is not bound to ACL 1.
Explanation: R1 has to have NAT-POOL2 bound to ACL 1. This is accomplished with the command R1(config)#ip nat inside source list 1 pool NAT-POOL2. This would enable the router to check for all interesting traffic and if it matches ACL 1 it would be translated by use of the addresses in NAT-POOL2.
Refer to the exhibit. What method can be used to enable an OSPF router to advertise a default route to neighboring OSPF routers?
Use a static route pointing to the ISP and redistribute it.
Use the redistribute static command on R0-A.
Use the default-information originate command on ISP.
Use the default-information originate command on R0-A.
Use the default-information originate command on R0-A.
A company has contracted with a network security firm to help identify the vulnerabilities of the corporate network. The firm sends a team to perform penetration tests to the company network. Why would the team use applications such as John the Ripper,THC Hydra, RainbowCrack, and Medusa?
to capture and analyze packets within traditional Ethernet LANs or WLANs
to probe and test the robustness of a firewall by using specially created forged packets
to make repeated guesses in order to crack a password
to make repeated guesses in order to crack a password
What are two syntax rules for writing a JSON array? (Choose two.)
Each value in the array is separated by a comma.
The array can include only one value type.
A space must separate each value in the array.
A semicolon separates the key and list of values.
Values are enclosed in square brackets.
Each value in the array is separated by a comma.
Values are enclosed in square brackets.
Explanation: A JSON array is a collection of ordered values within square brackets [ ]. The values in the array are separated by a comma. For example “users” : [“bob”, “alice”, “eve”].
What is a characteristic of a Trojan horse as it relates to network security?
An electronic dictionary is used to obtain a password to be used to infiltrate a key network device.
Malware is contained in a seemingly legitimate executable program.
Extreme quantities of data are sent to a particular network device interface.
Too much information is destined for a particular memory block, causing additional memory areas to be affected
Malware is contained in a seemingly legitimate executable program.
Explanation: A Trojan horse carries out malicious operations under the guise of a legitimate program. Denial of service attacks send extreme quantities of data to a particular host or network device interface. Password attacks use electronic dictionaries in an attempt to learn passwords. Buffer overflow attacks exploit memory buffers by sending too much information to a host to render the system inoperable
An attacker is redirecting traffic to a false default gateway in an attempt to intercept the data traffic of a switched network. What type of attack could achieve this?
TCP SYN flood
DNS tunneling
DHCP spoofing
ARP cache poisoning
DHCP spoofing
Explanation: In DHCP spoofing attacks, an attacker configures a fake DHCP server on the network to issue DHCP addresses to clients with the aim of forcing the clients to use a false default gateway, and other false services. DHCP snooping is a Cisco switch feature that can mitigate DHCP attacks. MAC address starvation and MAC address snooping are not recognized security attacks. MAC address spoofing is a network security threat.
A company is developing a security policy for secure communication. In the exchange of critical messages between a headquarters office and a branch office, a hash value should only be recalculated with a predetermined code, thus ensuring the validity of data source. Which aspect of secure communications is addressed?
data integrity
non-repudiation
origin authentication
data confidentiality
origin authentication
Explanation: Secure communications consists of four elements:
Data confidentiality – guarantees that only authorized users can read the message
Data integrity – guarantees that the message was not altered
Origin authentication – guarantees that the message is not a forgery and does actually come from whom it states
Data nonrepudiation – guarantees that the sender cannot repud
A company has contracted with a network security firm to help identify the vulnerabilities of the corporate network. The firm sends a team to perform penetration tests to the company network. Why would the team use packet sniffers?
to detect installed tools within files and directories that provide threat actors remote access and control over a computer or network
to detect any evidence of a hack or malware in a computer or network
to probe and test the robustness of a firewall by using specially created forged packets
to capture and analyze packets within traditional Ethernet LANs or WLANs
to capture and analyze packets within traditional Ethernet LANs or WLANs
An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 172.20.0.0 255.255.252.0. What wildcard mask would the administrator use in the OSPF network statement?
0.0.15.255
0.0.3.255
0.0.7.255
0.0.1.255
0.0.3.255
Refer to the exhibit. What is the OSPF cost to reach the West LAN 172.16.2.0/24 from East?
782
74
128
65
65
What is one reason to use the ip ospf priority command when the OSPF routing protocol is in use?
to activate the OSPF neighboring process
to influence the DR/BDR election process
to provide a backdoor for connectivity during the convergence process
to streamline and speed up the convergence process
to influence the DR/BDR election process
Explanation: The OSPF priority can be set to a number between 0 and 255. The higher the number set, the more likely the router becomes the DR. A priority 0 stops a router from participating in the election process and the router does not become a DR or a BDR.
What is a characteristic of the two-tier spine-leaf topology of the Cisco ACI fabric architecture?
The spine and leaf switches are always linked through core switches.
The spine switches attach to the leaf switches and attach to each other for redundancy.
The leaf switches always attach to the spines and they are interlinked through a trunk line.
The leaf switches always attach to the spines, but they never attach to each other.
The leaf switches always attach to the spines, but they never attach to each other.
Which two scenarios would result in a duplex mismatch? (Choose two.)
connecting a device with autonegotiation to another that is manually set to full-duplex
starting and stopping a router interface during a normal operation
connecting a device with an interface running at 100 Mbps to another with an interface running at 1000 Mbps
configuring dynamic routing incorrectly
manually setting the two connected devices to different duplex modes
connecting a device with autonegotiation to another that is manually set to full-duplex
manually setting the two connected devices to different duplex modes
A network technician is configuring SNMPv3 and has set a security level of auth . What is the effect of this setting?
authenticates a packet by a string match of the username or community string
authenticates a packet by using either the HMAC with MD5 method or the SHA method
authenticates a packet by using either the HMAC MD5 or 3.HMAC SHA algorithms and encrypts the packet with either the DES, 3DES or AES algorithms
authenticates a packet by using the SHA algorithm only
authenticates a packet by using either the HMAC with MD5 method or the SHA method
Explanation: For enabling SNMPv3 one of three security levels can be configured:
1) noAuth
2) auth
3) priv
The security level configured determines which security algorithms are performed on SNMP packets. The auth security level uses either HMAC with MD5 or SHA.
