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| Section | Objectives |
|---|---|
| Topic 1: Network Services | - Basic multicast concepts - NAT concepts in Junos |
| Topic 2: Routing Policy and Filtering | - Route filtering and preference control - Policy statements |
| Topic 3: Operations and Troubleshooting | - Junos CLI monitoring tools - Troubleshooting routing and switching issues |
| Topic 4: Layer 2 Switching Technologies | - Ethernet switching concepts - Spanning Tree Protocol (STP/RSTP/MSTP) - VLANs and trunking |
| Topic 5: Routing Protocols | - BGP fundamentals and policy control - IS-IS overview - OSPF configuration and troubleshooting |
| Topic 6: High Availability | - Redundancy concepts in enterprise networks - VRRP configuration and behavior |
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NEW QUESTION # 80
What is the maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation?
Answer: A
Explanation:
The maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation is
1476 bytes. This is because GRE packets are formed by the addition of the original packets and the required GRE headers. These headers are 24-bytes in length and since these headers are added to the original frame, depending on the original size of the packet we may run into IP MTU problems. The most common IP MTU is 1500-bytes in length (Ethernet). When the tunnel is created, it deducts the 24-bytes it needs to encapsulate the passenger protocols and that is the IP MTU it will use. For example, if we are forming a tunnel over FastEthernet (IP MTU 1500) the IOS calculates the IP MTU on the tunnel as: 1500-bytes from Ethernet-24-bytes for the GRE encapsulation = 1476-Bytes.
NEW QUESTION # 81
Your GRE tunnel is not transitioning to the Upstatus. What would be the first step in troubleshooting the problem?
Answer: C
NEW QUESTION # 82
Which sequence correctly describes the basic message flow that leads to a successful BGP peering session?
Answer: A
Explanation:
RFC 4271 defines the BGP finite state machine as a strict, ordered progression of six states that a session must move through to successfully establish. A newly configured or reset session always begins in Idle, where BGP initializes resources and refuses connections until the ConnectRetry timer fires. From Idle, the router transitions to Connect and attempts to establish the underlying TCP transport session to the configured peer address on port 179. If that TCP attempt does not immediately succeed, the session falls back to the Active state, where the router continues retrying the TCP connection in the background; once the TCP handshake finally completes (from either Connect or Active), the session advances to OpenSent, during which the router transmits its own BGP OPEN message advertising its AS number, hold time, BGP identifier, and capabilities.
Upon receiving and validating a compatible OPEN message from the peer, the session moves to OpenConfirm, where both sides exchange KEEPALIVE messages to confirm the parameters negotiated in the OPEN exchange are mutually acceptable. Only after this confirmation does the session reach Established, the final state in which UPDATE messages carrying actual routing information begin to flow between the peers.
Any deviation from this Idle # Connect # Active # OpenSent # OpenConfirm # Established ordering, as presented in the other answer choices, does not reflect the standardized BGP state machine. Reference topics:
Junos Enterprise Routing - BGP, The BGP Finite State Machine.
NEW QUESTION # 83
Which two statements about MACsec are true? (Choose two.)
Answer: A,D
NEW QUESTION # 84
Referring to the exhibit, which configuration change is needed for an IS-IS Level 1 adjacency between R1 and R2?
Answer: A
NEW QUESTION # 85
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