CISSP Practice question #69

On which TCP/IP layer do we find IP Addresses?
A: Link and physical.
B: Internetworks.
C: Transport.
D: Application.

CBK 4: Communication and Network Security
Source: practice tests


B: Internet/Internetwork layer is responsible of sending packets across potentially multiple networks. Requires sending data from the source network to the destination network (routing). The Internet Protocol performs two basic functions: Host addressing and identification: This is done with a hierarchical IP addresses. Packet routing: Sending the packets of data (datagrams) from the source to the destination by forwarding them to the next network router closer to the final destination.

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  1. Answer: B: Internetworks

    Network Interface Layer
    The Network Interface layer (also called the Network Access layer) is responsible for placing TCP/IP packets on the network medium and receiving TCP/IP packets off the network medium. TCP/IP was designed to be independent of the network access method, frame format, and medium. In this way, TCP/IP can be used to connect differing network types. These include LAN technologies such as Ethernet and Token Ring and WAN technologies such as X.25 and Frame Relay. Independence from any specific network technology gives TCP/IP the ability to be adapted to new technologies such as Asynchronous Transfer Mode (ATM).

    The Network Interface layer encompasses the Data Link and Physical layers of the OSI model. Note that the Internet layer does not take advantage of sequencing and acknowledgment services that might be present in the Data-Link layer. An unreliable Network Interface layer is assumed, and reliable communications through session establishment and the sequencing and acknowledgment of packets is the responsibility of the Transport layer.

  2. B , network layer is responsible for transmitting and routing data packets over the network. internet uses IP as its network layer. each node on the network has an address, which of course is called the IP address. data is sent as IP packets.

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