Redes de Ordenadores (ENG) | Universidad de Deusto

What do the following IPv4 addresses have in common? 10.0.2.0, 192.168.130.0 and 172.16.15.0. All are IPv4 addresses. All are reserved addresses. All answers are correct.

What is the CIDR of the following subnet mask 255.255.255.224?. No associated CIDR. 26. 27.

How many network devices can a type B subnetwork accommodate at most?. 65023. 65534. 65512.

How many octets does the network identification part of an IPv4 type A address have?. As many as the number of bits it contains. Four. One.

Why was the transition from classful to classless networking made?. It was the new fad/trend among ISPs in the early 1990s. Never switched to classless. Enabled better utilization of IP address blocks.

What is the BGP protocol?. It is a routing protocol between autonomous systems at the link level. It is a routing protocol between autonomous systems at the network level. It is a routing protocol between autonomous systems at the transport level.

What is the largest number of subnets I can create with a /24 network block? Note that each subnet must have at least one router and 1 host in the network. 64. 32. 128.

Where would you encapsulate an IP packet for transmission within a local area network?. In a datagram. In a frame. In a segment.

If you have to send a packet to a remote host, what metrics should you use at the routing level to know whether to send it one way or the other?. Administrative distance. Depends on the routing protocol. The number of hops to the remote host.

The routing tables are hosted in... Routers. Routers and switches. Routers, switches and PCs.

ICMP is a protocol that is used at the... Network. From liaison. Transversal between applications and network.

At what level of the TCP/IP layer does a Network Hub operate?. At the network layer. At the physical layer of the network. At the network link layer.

Why is a switch said to be transparent in a network?. Because it does not have an IP address. Because they do not modify the plots that pass through them. Both answers are correct.

Which network devices avoid collision domains?. The hubs. Switches. None is correct.

A root node... It is determined by the one with the lowest ID of the topology. You have all your ports labeled as root ports. All are correct.

What happens when a switch receives a frame on a port whose address is associated with that port in its switch table?. Discard or filter it. Forwards it through the port. Write down this event in your switching table.

How is the Message Age field of a BDPU like the ICMP TTL?. In which they give information about the hops that a packet/frame has made in a network. In that both serve to limit the propagation of messages in the network. In that both serve to discard packages if they do not reach their destination.

The ARP protocol... Resolves IP addresses to MAC addresses. Resolves MAC addresses to IP addresses. Both resolutions are correct for the ARP protocol.

What network devices prevent broadcast storms at the link level?. The hubs. Switches via VLANs. None of the above answers is correct.

What is packet encapsulation and decapsulation for?. To hide the IP address of sender and recipient. To add and remove protocol headers during sending and receiving data. To create more effective subnets.

How many types of IPs exist?. IPv4 & IPv6. Public IPs & Private IPs. All the answers are correct.

The 802.11q protocol... Adds a field to Ethernet frames to notify of VLAN membership. Notifies hosts on the network which VLAN they belong to. It is a physical level protocol.

What of the next answers is not a working mode of a switch?. Store & forward. Fragment full. Cut-through.

A STP tree is always... Acyclic. Acyclic. Acyclic.

How do you choose the designated port of a segment if there are two switches connected to it?. The one with the lowest link cost. Whoever has the most reliable link. None of the above answers is correct.

What is the broadcast address of the network 192.168.0.1/27?. 192.168.0.255. 192.168.0.31. 192.168.0.15.

Which one of the following communications is not supported by IPv6?. Broadcast. Multicast. Unicast.

Which one is a valid IPv6 address among the following?. 2001:0DB8:0000:ABCD::1234. 2001:0DB8::ABCD::1234. All.

Which statement about IPv6 address is correct?. An IPv6 address is 128 bits long, represented in hexadecimal. An IPv6 address is 32 bits long, represented in hexadecimal. An IPv6 address is 256 bits long, represented in hexadecimal.