Foram encontradas 39.129 questões.
Provas
Assinale a opção que apresenta o equipamento que originalmente (sem nenhuma configuração avançada) separa tanto o domínio de colisão quanto o de broadcast.
Provas
Nesse caso, é possível afirmar que o TLS fará uso de
Provas
Com relação ao TCP, analise as afirmativas a seguir.
I. O funcionamento correto do TCP requer o estabelecimento de uma conexão entre a origem e o destino final.
II. O controle de fluxo é implementado por meio de um protocolo do tipo janela deslizante.
III. Todas as conexões TCP são do tipo full-duplex e ponto a ponto.
Está correto o que se afirma em
Provas
Com relação ao endereçamento IPv4 (IP versão 4), analise as afirmativas a seguir.
I. Considerando a máscara de subrede 255.255.128.0, os endereços IPv4 192.168.91.0 e 192.168.48.10 estão na mesma subrede.
II. A faixa de endereços IPv4 referente ao prefixo 124.201.0.0/18 vai de 124.201.0.0 a 124.201.63.255.
III. Todas as interfaces de rede de um mesmo dispositivo possuem o mesmo endereço IPv4.
Está correto o que se afirma em
Provas
- Modelo OSIIntrodução ao Modelo OSI
- Modelo OSIModelo OSI: Camada de Rede
- Modelo OSIModelo OSI: Camada de Transporte
Com relação ao modelo OSI, analise as afirmativas a seguir.
I. A camada de Transporte, ao contrário da camada de Rede, é fim-a-fim, ou seja, liga a origem ao destino.
II. A camada de Rede é responsável pelo controle de erros de transmissão.
III. O modelo OSI abstrai as conexões físicas entre os nós da rede, não possuindo uma camada específica para esse fim.
Está correto o que se afirma em
Provas
SERVICES PROVIDED BY DATA LINK PROTOCOLS
The Space Data Link Protocols provide several services to transfer a variety of data on a space link. The most important service is a service to transfer variable-length data units known as packets (i.e., protocol data units of protocols of the Network Layer). In addition to this service, the Space Data Link Protocols provide services to transfer fixed- or variable length data units with private (non-CCSDS) formats, short fixed-length data units for reporting on real-time functions, and bit streams. Fonte: Extraído e adaptado do relatório CCSDS 130.0-G-4 “Overview of Space Communications Protocols”.
Baseando-se exclusivamente no texto acima, assinale a opção que apresenta o serviço mais importante fornecido pelos Protocolos de Link de Dados Espaciais.
Provas
- Arquitetura de RedesDTN: Delay/Disruption Tolerant Networking
- Modelo OSIModelo OSI: Camada de Rede
- Protocolos e Serviços
Texto III
3.3 NETWORK LAYER
3.3.1 GENERAL FEATURES OF NETWORK PROTOCOLS
Data Forwarding differs greatly from data routing, defined in reference [60] as ‘the process of selecting paths from origins to destinations in a network’. Here, the concept of an endpoint is global over a series of open and extensible subnetworks. Whenever routing is done across multiple subnetworks, a network routing protocol is required, which is not in the purview of SPP. It is essential that when one plans to route data over an open network composed of multiple subnetworks, one uses a network protocol.
By using the Encapsulation Packet Protocol as a shim, other CCSDS-recognized Network Protocols such as BP (references [55] and [56]) and IP can be used over space links. The data units of network protocols can also be transferred using the Space Packet Protocol done in a mission-specific manner using APID(s) as set by management. Over a space link, protocol data units of the network protocols (i.e., BP, IP, or others carried through SPP or EPP) are transferred within the Space Data Link Protocols. In particular, the Space Data Link Protocols have the capability to carry several protocol data units of the Internet Protocol, multiplexed or not- multiplexed, within the Encapsulation packet. IP over CCSDS (reference [45]) specifies how CCSDS-recognized IP datagrams are transferred over the link.
3.3.2 ADDRESSING OF NETWORK PROTOCOLS
An End System Identifier, as used by IP and BP, unambiguously identifies a single end system or a group of end systems. If it is necessary to identify both the source and destination when using End System Identifiers, a pair of End System Identifiers must be used. These identifiers, which either identify or map to locations in network topology, are specified in the IP or BP PDUs, and they are used by the IP or BP routing nodes to perform routing decisions at each step along the end-to-end path.
As already mentioned, CCSDS Encapsulation Packet Protocol allows the use of other CCSDS recognized Network Protocols within their own end system identification notations. CCSDS developed Delay Tolerant Networking (references [55] and [56]) as the means to perform interoperable internetworking in space, in either disrupted or delayed end-to-end communication environments.
ACRONYMS
APID: Application Process Identifier
BP: Bundle Protocol
CCSDS: Consultative Committee for Space Data Systems
EPP: Encapsulation Packet Protocol
IP: Internet Protocol
SPP: Space Packet Protocol
Fonte: Extraído e adaptado do relatório CCSDS 130.0-G-4 “Overview of Space Communications Protocols”.
Assinale a opção que indica a principal função do Protocolo de Encapsulamento de Pacotes em redes de comunicação espacial.
Provas
- Arquitetura de RedesDTN: Delay/Disruption Tolerant Networking
- Modelo TCP/IPModelo TCP/IP: Camada de Rede
- TCP/IPConceitos e Especificações do IP
- TCP/IPFundamentos de Roteamento
Texto III
3.3 NETWORK LAYER
3.3.1 GENERAL FEATURES OF NETWORK PROTOCOLS
Data Forwarding differs greatly from data routing, defined in reference [60] as ‘the process of selecting paths from origins to destinations in a network’. Here, the concept of an endpoint is global over a series of open and extensible subnetworks. Whenever routing is done across multiple subnetworks, a network routing protocol is required, which is not in the purview of SPP. It is essential that when one plans to route data over an open network composed of multiple subnetworks, one uses a network protocol.
By using the Encapsulation Packet Protocol as a shim, other CCSDS-recognized Network Protocols such as BP (references [55] and [56]) and IP can be used over space links. The data units of network protocols can also be transferred using the Space Packet Protocol done in a mission-specific manner using APID(s) as set by management. Over a space link, protocol data units of the network protocols (i.e., BP, IP, or others carried through SPP or EPP) are transferred within the Space Data Link Protocols. In particular, the Space Data Link Protocols have the capability to carry several protocol data units of the Internet Protocol, multiplexed or not- multiplexed, within the Encapsulation packet. IP over CCSDS (reference [45]) specifies how CCSDS-recognized IP datagrams are transferred over the link.
3.3.2 ADDRESSING OF NETWORK PROTOCOLS
An End System Identifier, as used by IP and BP, unambiguously identifies a single end system or a group of end systems. If it is necessary to identify both the source and destination when using End System Identifiers, a pair of End System Identifiers must be used. These identifiers, which either identify or map to locations in network topology, are specified in the IP or BP PDUs, and they are used by the IP or BP routing nodes to perform routing decisions at each step along the end-to-end path.
As already mentioned, CCSDS Encapsulation Packet Protocol allows the use of other CCSDS recognized Network Protocols within their own end system identification notations. CCSDS developed Delay Tolerant Networking (references [55] and [56]) as the means to perform interoperable internetworking in space, in either disrupted or delayed end-to-end communication environments.
ACRONYMS
APID: Application Process Identifier
BP: Bundle Protocol
CCSDS: Consultative Committee for Space Data Systems
EPP: Encapsulation Packet Protocol
IP: Internet Protocol
SPP: Space Packet Protocol
Fonte: Extraído e adaptado do relatório CCSDS 130.0-G-4 “Overview of Space Communications Protocols”.
Assinale a opção que apresenta o propósito de usar um Identificador de Sistema Final em protocolos de rede como IP e BP.
Provas
Diante do exposto, assinale a opção que indica a especificação que atende aos requisitos.
Provas
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