Why do clients run the Address Resolution Protocol (ARP)?
Answer(s): A
Clients run the Address Resolution Protocol (ARP) to discover the MAC address associated with a given IP address in order to send packets at the data link layer. In other words, ARP helps to discover the destination MAC address of the Layer 2 header of IP packets based on the destination IP address in the Layer 3 header.
Refer to the Exhibit.The PCs are not able to successfully establish bidirectional communication. What change must you deploy to enable the communication between PC-1 and PC-2?
Answer(s): C
To enable bidirectional communication between PC-1 and PC-2, the Router's 1/1/1 interface IP address should be changed to 172.16.30.254, which is in the same subnet as PC-1 and PC-2. The default gateway of both PCs is already set correctly to the Router's 1/1/1 interface IP address. Changing the IP addresses of PC-1 or PC-2 will not resolve the issue as they are already in the correct subnet.
Which Wi-Fi frame announces the Service Set Identifier (SSID) to Basic Service Set Identifier (BSSID) mapping?
The Wi-Fi beacon frame is a type of management frame used to announce the presence of a wireless LAN (WLAN) and provide information about it, such as the Service Set Identifier (SSID), Basic Service Set Identifier (BSSID), and supported data rates. When a client device receives a beacon frame, it can use the information to determine whether to connect to the WLAN.
Refer to the Exhibit.The PC is sending a message to the server. Which devices have performed Layer 2 encapsulation by the time the message arrives at the server? (Select two.)
Answer(s): D,E
Layer 2 encapsulation happens at each hop in the network. In this scenario, the message has to pass through Switch-1 and Switch-2 to reach the server. Therefore, both Switch-1 and Switch-2 perform Layer 2 encapsulation before the message reaches the server. The PC and server do not perform Layer 2 encapsulation as they are the source and destination devices, respectively. The router also does not perform Layer 2 encapsulation as it is a Layer 3 device.
Which statements are true about a router? (Select two.)
Answer(s): B,D
A router is considered a layer three device in the OSI model. Its primary function is to forward packets between networks. Routers utilize various protocols to learn and maintain the best path to forward traffic to the destination. Some examples of such protocols include RIP (Routing Information Protocol), OSPF (Open Shortest Path First), and BGP (Border Gateway Protocol). Therefore, options B and D are true about a router.
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