Use consistent header level for TOC generation

specs/networking/p2p-interface.md

@@ -18,23 +18,88 @@ It consists of four main sections:
 
 - [Network fundamentals](#network-fundamentals)
   - [Transport](#transport)
+      - [Interop](#interop)
+      - [Mainnet](#mainnet)
   - [Encryption and identification](#encryption-and-identification)
+      - [Interop](#interop-1)
+      - [Mainnet](#mainnet-1)
   - [Protocol Negotiation](#protocol-negotiation)
+      - [Interop](#interop-2)
+      - [Mainnet](#mainnet-2)
   - [Multiplexing](#multiplexing)
 - [Eth2 network interaction domains](#eth2-network-interaction-domains)
   - [Configuration](#configuration)
   - [The gossip domain: gossipsub](#the-gossip-domain-gossipsub)
+    - [Topics and messages](#topics-and-messages)
+      - [Global topics](#global-topics)
+      - [Attestation subnets](#attestation-subnets)
+      - [Interop](#interop-3)
+      - [Mainnet](#mainnet-3)
+    - [Encodings](#encodings)
+      - [Interop](#interop-4)
+      - [Mainnet](#mainnet-4)
   - [The Req/Resp domain](#the-reqresp-domain)
+    - [Protocol identification](#protocol-identification)
+    - [Req/Resp interaction](#reqresp-interaction)
+      - [Requesting side](#requesting-side)
+      - [Responding side](#responding-side)
+    - [Encoding strategies](#encoding-strategies)
+      - [SSZ-encoding strategy (with or without Snappy)](#ssz-encoding-strategy-with-or-without-snappy)
+    - [Messages](#messages)
+      - [Status](#status)
+      - [Goodbye](#goodbye)
+      - [BeaconBlocksByRange](#beaconblocksbyrange)
+      - [BeaconBlocksByRoot](#beaconblocksbyroot)
   - [The discovery domain: discv5](#the-discovery-domain-discv5)
+    - [Integration into libp2p stacks](#integration-into-libp2p-stacks)
+    - [ENR structure](#enr-structure)
+      - [Interop](#interop-5)
+      - [Mainnet](#mainnet-5)
+    - [Topic advertisement](#topic-advertisement)
+      - [Interop](#interop-6)
+      - [Mainnet](#mainnet-6)
 - [Design decision rationale](#design-decision-rationale)
   - [Transport](#transport-1)
+    - [Why are we defining specific transports?](#why-are-we-defining-specific-transports)
+    - [Can clients support other transports/handshakes than the ones mandated by the spec?](#can-clients-support-other-transportshandshakes-than-the-ones-mandated-by-the-spec)
+    - [What are the advantages of using TCP/QUIC/Websockets?](#what-are-the-advantages-of-using-tcpquicwebsockets)
+    - [Why do we not just support a single transport?](#why-do-we-not-just-support-a-single-transport)
+    - [Why are we not using QUIC for mainnet from the start?](#why-are-we-not-using-quic-for-mainnet-from-the-start)
   - [Multiplexing](#multiplexing-1)
+    - [Why are we using mplex/yamux?](#why-are-we-using-mplexyamux)
   - [Protocol Negotiation](#protocol-negotiation-1)
+    - [When is multiselect 2.0 due and why are we using it for mainnet?](#when-is-multiselect-20-due-and-why-are-we-using-it-for-mainnet)
+    - [What is the difference between connection-level and stream-level protocol negotiation?](#what-is-the-difference-between-connection-level-and-stream-level-protocol-negotiation)
   - [Encryption](#encryption)
+    - [Why are we using SecIO for interop? Why not for mainnet?](#why-are-we-using-secio-for-interop-why-not-for-mainnet)
+    - [Why are we using Noise/TLS 1.3 for mainnet?](#why-are-we-using-noisetls-13-for-mainnet)
+    - [Why are we using encryption at all?](#why-are-we-using-encryption-at-all)
+    - [Will mainnnet networking be untested when it launches?](#will-mainnnet-networking-be-untested-when-it-launches)
   - [Gossipsub](#gossipsub)
+    - [Why are we using a pub/sub algorithm for block and attestation propagation?](#why-are-we-using-a-pubsub-algorithm-for-block-and-attestation-propagation)
+    - [Why are we using topics to segregate encodings, yet only support one encoding?](#why-are-we-using-topics-to-segregate-encodings-yet-only-support-one-encoding)
+    - [How do we upgrade gossip channels (e.g. changes in encoding, compression)?](#how-do-we-upgrade-gossip-channels-eg-changes-in-encoding-compression)
+    - [Why must all clients use the same gossip topic instead of one negotiated between each peer pair?](#why-must-all-clients-use-the-same-gossip-topic-instead-of-one-negotiated-between-each-peer-pair)
+    - [Why are the topics strings and not hashes?](#why-are-the-topics-strings-and-not-hashes)
+    - [Why are there `ATTESTATION_SUBNET_COUNT` attestation subnets?](#why-are-there-attestation_subnet_count-attestation-subnets)
+    - [Why are attestations limited to be broadcast on gossip channels within `SLOTS_PER_EPOCH` slots?](#why-are-attestations-limited-to-be-broadcast-on-gossip-channels-within-slots_per_epoch-slots)
+    - [Why are aggregate attestations broadcast to the global topic as `AggregateAndProof`s rather than just as `Attestation`s?](#why-are-aggregate-attestations-broadcast-to-the-global-topic-as-aggregateandproofs-rather-than-just-as-attestations)
+    - [Why are we sending entire objects in the pubsub and not just hashes?](#why-are-we-sending-entire-objects-in-the-pubsub-and-not-just-hashes)
+    - [Should clients gossip blocks if they *cannot* validate the proposer signature due to not yet being synced, not knowing the head block, etc?](#should-clients-gossip-blocks-if-they-cannot-validate-the-proposer-signature-due-to-not-yet-being-synced-not-knowing-the-head-block-etc)
+    - [How are we going to discover peers in a gossipsub topic?](#how-are-we-going-to-discover-peers-in-a-gossipsub-topic)
   - [Req/Resp](#reqresp)
+    - [Why segregate requests into dedicated protocol IDs?](#why-segregate-requests-into-dedicated-protocol-ids)
+    - [Why are messages length-prefixed with a protobuf varint in the SSZ-encoding?](#why-are-messages-length-prefixed-with-a-protobuf-varint-in-the-ssz-encoding)
+    - [Why do we version protocol strings with ordinals instead of semver?](#why-do-we-version-protocol-strings-with-ordinals-instead-of-semver)
+    - [Why is it called Req/Resp and not RPC?](#why-is-it-called-reqresp-and-not-rpc)
   - [Discovery](#discovery)
+    - [Why are we using discv5 and not libp2p Kademlia DHT?](#why-are-we-using-discv5-and-not-libp2p-kademlia-dht)
+    - [What is the difference between an ENR and a multiaddr, and why are we using ENRs?](#what-is-the-difference-between-an-enr-and-a-multiaddr-and-why-are-we-using-enrs)
   - [Compression/Encoding](#compressionencoding)
+    - [Why are we using SSZ for encoding?](#why-are-we-using-ssz-for-encoding)
+    - [Why are we compressing, and at which layers?](#why-are-we-compressing-and-at-which-layers)
+    - [Why are using Snappy for compression?](#why-are-using-snappy-for-compression)
+    - [Can I get access to unencrypted bytes on the wire for debugging purposes?](#can-i-get-access-to-unencrypted-bytes-on-the-wire-for-debugging-purposes)
 - [libp2p implementations matrix](#libp2p-implementations-matrix)
 
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