Refer to the exhibit.

The OSPF neighborship fails between two routers. What is the cause of this issue?

• A.The OSPF process is stopped on the neighbor router.
• B.There is an MTU mismatch between the two routers.
• C.The OSPF router ID is missing on this router.
• D.The OSPF router ID is missing on the neighbor router.

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Which method does Cisco DNA Center use to allow management of non-Cisco devices through southbound protocols?

• A.It creates device packs through the use of an SDK
• B.It uses an API call to interrogate the devices and register the returned data.
• C.It obtains MIBs from each vendor that details the APIs available.
• D.It imports available APIs for the non-Cisco device in a CSV format.

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If the noise floor is -90 dBm and wireless client is receiving a signal of -75 dBm, what is the SNR?

• A.15
• B.-165
• C..83
• D.1.2

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A wireless consultant is designing a high-density wireless network for a lecture hall for 1000 students Which antenna type is recommended for this environment?

• A.sector antenna
• B.dipole antenna
• C.parabolic dish
• D.omnidirectional antenna

Correct Answer: D

Directional antennas Directional antennas come in many different styles and shapes. An antenna does not offer any added power to the signal; it simply redirects the energy it receives from the transmitter. By redirecting this energy, it has the effect of providing more energy in one direction and less energy in all other directions. As the gain of a directional antenna increases, the angle of radiation usually decreases, providing a greater coverage distance but with a reduced coverage angle. Directional antennas include patch antennas and parabolic dishes. Parabolic dishes have a very narrow RF energy path, and the installer must be accurate in aiming these types of antennas at each other.

Reference:
Omnidirectional antennas
An omnidirectional antenna is designed to provide a 360-degree radiation pattern. This type of antenna is used when coverage in all directions from the antenna is required. The standard 2.14-dBi "rubber duck" is one style of omnidirectional antenna.
Omnidirectional antenna

-> Therefore Omnidirectional antenna is best suited for a high-density wireless network in a lecture hall.

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Refer to the exhibit.

Hosts PC1 PC2 and PC3 must access resources on Serve 1. An engineer
configures NAT on Router R1 1e enable the communication and enters the show command to verify operation Which IP address is used by the hosts when they communicate globally to Server1?

• A.155.1.1.1
• B.their own address in the 10.10.10.0/24 rance
• C.155.1.1.5
• D.randorm addresses in the 155.1.1.0/24 range

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