Content delivery network

Here you will find answers to CCNA drag and drop questions

Question 1:

The left describes some types of connections while the right describes some types of cables. Drag the items on the left to the proper locations.

Answer:

Explanation:

To specify when we use crossover cable or straight-through cable, we should remember:
Group 1: Router, Host(PC), Server
Group 2: Hub, Switch
One device in group 1 + One device in group 2: use straight-through cable
Two devices in the same group: use crossover cable

For example: we use straight-through cable to connect switch to router, switch to host, hub to host, hub to server… and we use crossover cable to connect switch to switch, switch to hub, router to router, host to host… ).

+ We can connect a modem to router auxiliary port using a rollover cable. Recall that the purpose of the router’s auxiliary port is for connecting to a modem and most Cisco routers have a second port on the back called the auxiliary port. We can use this port in case of a far-away router goes down, the administrator can have someone in the area go to the router, plug in a modem and access to the router remotely (if using the console port, we have to go to the site to work with that router).

+ We can connect a PC serial port to a switch/router console port through the RJ-45 to DB-9 or RJ-45 to DB-25 adapter (at the PC end), depending on the computer. Here is a good resource about this type of connection

Question 2:

The above provides some descriptions, while the below provides some routing protocols. Drag the above items to the proper locations.

Answer:

Explanation:

Enhanced Interior Gateway Routing Protocol (EIGRP) is a Cisco proprietary routing protocol, so it is vendor-specific. By default, EIGRP internal routes have an administrative distance value of 90.

OSPF uses cost as its metric. By default, the cost of an interface is calculated based on bandwidth with the formula cost= 10000 0000/bandwith (in bps). OSPF elects a DR on each broadcast and nonbroadcast multiaccess networks (like Ethernet and Frame Relay environments, respectively). It doesn’t elect a DR on point-to-point link (like a serial WAN).

Question 3:

The above describes the Spanning-Tree Protocol port states, while the below describes their functions. Drag the above items to the proper locations.

Answer:

Explanation:

Blocking state: When the STP is enabled, all the switches (and bridges) in the network start in blocking state. In this state, it does not participate in frame forwarding. After initialization, all switches assume they are root until they exchange Bridge Protocol Data Units (BPDUs) with other switches in the network. The exchange happens until only one switch stills think it is the root. At that time, no exchange occurs, and after the forward delay time expires, the ports move to the listening state.

Listening state: The port listens to BPDUs to make sure no loops occur on the netwrok before passing data frames. A port in this state prepares to forward data frames without populating the MAC address table.

Learning state: The port listens to BPDUs and learns all the paths in the network. In this state, it populates the MAC address table but does not forward data frames.

Forwarding state: The port sends and receives data frames.

Question 4:

Drag the Frame Relay acronym on the left to match its definition on the right (not all acronyms are used)

Answer:

Explanation:

In Frame Relay, a DTE is often known as the router at the customer site while DCE is often the switch of the Internet Service Provider (ISP).

There are two types of virtual circuits: Permanent virtual circuits (PVCs) and Switched virtual circuits (SVCs). PVC is a virtual circuit that is permanently availble whille SVC is a dynamically established virtual circuit, created on demand and dissolved as soon as transmission is over and the circuit is no longer needed. PVCs are by far the most common type in use today.

One of the LMI (Local Management Interface) features (or extensions) is the virtual-circuit status message, which provides communication and synchronization between Frame Relay DTE and DCE devices.

Frame Relay virtual circuits are identified by Data Link Connection Identifiers (DLCIs). DLCIs have local significance, which means that the values themselves are not unique in the Frame Relay WAN.

Question 5:

As a CCNA candidate, you are required to have a firm understanding of the OSI model. At which layers of the OSI model do Wide Area Networks operate in? Please drag the items to the proper locations.

Answer:

Explanation:

WAN operates in the two lowest layers which are Data Link and Physical layers.