Cisco Updated 200-301 Exam Questions and Answers by nolan

TCP is the protocol that builds a session before application data is sent; UDP does not. In the CCNA v1.1 network fundamentals scope, this is the practical distinction between connection-oriented and connectionless transport. TCP uses a three-way handshake: the client sends SYN, the server replies with SYN-ACK, and the client answers with ACK. After that, TCP can number segments, acknowledge received data, retransmit missing data, and apply flow control through windowing. UDP skips that establishment process. It sends datagrams without negotiating a session and without guaranteeing that the receiver gets every datagram in order. That makes UDP faster and simpler for voice, video, DNS, DHCP, and other traffic that can tolerate loss or implement recovery at the application layer. Options A, B, and C distort the protocol behavior. UDP does not use SYN/SYN-ACK/ACK, and UDP is not the reliable transport. Cisco CCNA v1.1 expects this exact operational contrast: TCP establishes and protects delivery; UDP sends without connection setup.

Answer D and E is the technically correct selection. Cisco WLC service-port management supports Telnet and SSH access. The service port is an out-of-band management interface and can be used for direct management connectivity depending on platform configuration. This aligns with Cisco CCNA 200-301 v1.1 because the exam blueprint requires engineers to recognize operational behaviour from configuration symptoms and topology requirements. RADIUS and TACACS+ are AAA protocols, and SCP is file transfer, not the pair of management access protocols asked here. Treat the distractors carefully: most are real Cisco terms, but they solve a different problem or operate at a different layer. The selected answer is the one that would be used by an engineer on the device or in the design to produce the outcome stated in the question.

Weighted Random Early Detection is a congestion-avoidance mechanism. It starts dropping selected packets before an output queue becomes completely full, which helps avoid tail drop and TCP global synchronization. WRED can weight the drop behavior by IP precedence or DSCP so lower-priority traffic is more likely to be dropped before higher-priority traffic. That makes options A and D correct. WRED does not guarantee delivery of high-priority packets; it only changes drop probabilities. It also does not perform deep flow identification with high granularity, and it is not a protocol-discovery feature. In QoS design, classification and marking identify traffic, congestion management schedules traffic, and congestion avoidance drops early to prevent queue collapse. CCNA 200-301 v1.1 IP Services includes QoS behavior at a conceptual level, and WRED is best remembered as selective early drop based on traffic marking. Reference: Cisco QoS congestion avoidance and WRED behavior.

Pure IPsec protects unicast IP traffic well, but it does not natively carry multicast or broadcast traffic across sites in the way routing protocols and some legacy services may require. GRE can encapsulate many traffic types, including multicast, inside a unicast tunnel. When GRE is combined with IPsec, GRE provides the tunnel that can carry multicast traffic and IPsec provides encryption and integrity protection for the GRE packets. This is why GRE over IPsec is a common design when encrypted site-to-site connectivity must also support routing protocol hellos or multicast-dependent control traffic. ISATAP is an IPv6 transition mechanism, not the answer for encrypted multicast between remote sites. GRE alone carries the traffic but does not encrypt it. Cisco CCNA 200-301 v1.1 Security Fundamentals expects candidates to understand the division of labor: GRE encapsulates; IPsec secures. Therefore, the mechanism that carries multicast between remote sites and supports encryption is GRE over IPsec.